Keep the colleague's microbu-esp32c5 tree in this repository

obu-firmware builds against vanetza-idf from microbu-esp32c5/external, but
that tree was gitignored, so a clone of this repository could not build the
firmware it ships. It is now committed here as ordinary files in its own
folder, microbu-esp32c5/: the colleague's commit cf4b99f plus the V2X2MAP
bridge's signature verification (--trust) used on the bench. Nothing is
fetched from or pushed to the colleague's repository; this repository and
its remotes carry everything. The folder's own .gitignore keeps build output,
downloaded components and private key material out, as it did there; the
committed file set is identical to that repository's tracked files.

The ESP32-C5 is still flashed from obu-firmware/, which only takes
vanetza-idf from microbu-esp32c5/, so the two stay separate folders.
FLASHING.md says how to take a newer version of the colleague's tree (copy
it over the folder, rebuild, test, commit).

microbu-esp32c5/external/vanetza-idf/vanetza/asn1/its/SpeedConfidenceIso.c

@@ -0,0 +1,83 @@
+/*
+ * Generated by asn1c
+ * From ASN.1 module "DSRC"
+ * 	found in "ISO19091.asn"
+ * 	`asn1c -fcompound-names -fincludes-quoted -no-gen-example -R`
+ */
+
+#include "SpeedConfidenceIso.h"
+
+/*
+ * This type is implemented using NativeEnumerated,
+ * so here we adjust the DEF accordingly.
+ */
+#if !defined(ASN_DISABLE_OER_SUPPORT)
+asn_oer_constraints_t asn_OER_type_SpeedConfidenceIso_constr_1 CC_NOTUSED = {
+	{ 0, 0 },
+	-1};
+#endif  /* !defined(ASN_DISABLE_OER_SUPPORT) */
+#if !defined(ASN_DISABLE_UPER_SUPPORT) || !defined(ASN_DISABLE_APER_SUPPORT)
+asn_per_constraints_t asn_PER_type_SpeedConfidenceIso_constr_1 CC_NOTUSED = {
+	{ APC_CONSTRAINED,	 3,  3,  0,  7 }	/* (0..7) */,
+	{ APC_UNCONSTRAINED,	-1, -1,  0,  0 },
+	0, 0	/* No PER value map */
+};
+#endif  /* !defined(ASN_DISABLE_UPER_SUPPORT) || !defined(ASN_DISABLE_APER_SUPPORT) */
+static const asn_INTEGER_enum_map_t asn_MAP_SpeedConfidenceIso_value2enum_1[] = {
+	{ 0,	11,	"unavailable" },
+	{ 1,	9,	"prec100ms" },
+	{ 2,	8,	"prec10ms" },
+	{ 3,	7,	"prec5ms" },
+	{ 4,	7,	"prec1ms" },
+	{ 5,	9,	"prec0-1ms" },
+	{ 6,	10,	"prec0-05ms" },
+	{ 7,	10,	"prec0-01ms" }
+};
+static const unsigned int asn_MAP_SpeedConfidenceIso_enum2value_1[] = {
+	7,	/* prec0-01ms(7) */
+	6,	/* prec0-05ms(6) */
+	5,	/* prec0-1ms(5) */
+	1,	/* prec100ms(1) */
+	2,	/* prec10ms(2) */
+	4,	/* prec1ms(4) */
+	3,	/* prec5ms(3) */
+	0	/* unavailable(0) */
+};
+const asn_INTEGER_specifics_t asn_SPC_SpeedConfidenceIso_specs_1 = {
+	asn_MAP_SpeedConfidenceIso_value2enum_1,	/* "tag" => N; sorted by tag */
+	asn_MAP_SpeedConfidenceIso_enum2value_1,	/* N => "tag"; sorted by N */
+	8,	/* Number of elements in the maps */
+	0,	/* Enumeration is not extensible */
+	1,	/* Strict enumeration */
+	0,	/* Native long size */
+	0
+};
+static const ber_tlv_tag_t asn_DEF_SpeedConfidenceIso_tags_1[] = {
+	(ASN_TAG_CLASS_UNIVERSAL | (10 << 2))
+};
+asn_TYPE_descriptor_t asn_DEF_SpeedConfidenceIso = {
+	"SpeedConfidenceIso",
+	"SpeedConfidenceIso",
+	&asn_OP_NativeEnumerated,
+	asn_DEF_SpeedConfidenceIso_tags_1,
+	sizeof(asn_DEF_SpeedConfidenceIso_tags_1)
+		/sizeof(asn_DEF_SpeedConfidenceIso_tags_1[0]), /* 1 */
+	asn_DEF_SpeedConfidenceIso_tags_1,	/* Same as above */
+	sizeof(asn_DEF_SpeedConfidenceIso_tags_1)
+		/sizeof(asn_DEF_SpeedConfidenceIso_tags_1[0]), /* 1 */
+	{
+#if !defined(ASN_DISABLE_OER_SUPPORT)
+		&asn_OER_type_SpeedConfidenceIso_constr_1,
+#endif  /* !defined(ASN_DISABLE_OER_SUPPORT) */
+#if !defined(ASN_DISABLE_UPER_SUPPORT) || !defined(ASN_DISABLE_APER_SUPPORT)
+		&asn_PER_type_SpeedConfidenceIso_constr_1,
+#endif  /* !defined(ASN_DISABLE_UPER_SUPPORT) || !defined(ASN_DISABLE_APER_SUPPORT) */
+#if !defined(ASN_DISABLE_JER_SUPPORT)
+		0,
+#endif  /* !defined(ASN_DISABLE_JER_SUPPORT) */
+		NativeEnumerated_constraint
+	},
+	0, 0,	/* Defined elsewhere */
+	&asn_SPC_SpeedConfidenceIso_specs_1	/* Additional specs */
+};
+