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FLASHING.md says how to take a newer version of the colleague's tree (copy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/LPN.h

@@ -0,0 +1,82 @@
+/*
+ * Generated by asn1c
+ * From ASN.1 module "EfcDsrcApplication"
+ * 	found in "ISO14906-0-6.asn"
+ * 	`asn1c -fcompound-names -fincludes-quoted -no-gen-example -R`
+ */
+
+#ifndef	_LPN_H_
+#define	_LPN_H_
+
+
+#include "asn_application.h"
+
+/* Including external dependencies */
+#include "CountryCode.h"
+#include "NativeEnumerated.h"
+#include "OCTET_STRING.h"
+#include "constr_SEQUENCE.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Dependencies */
+typedef enum LPN__alphabetIndicator {
+	LPN__alphabetIndicator_latinAlphabetNo1	= 1,
+	LPN__alphabetIndicator_latinAlphabetNo2	= 2,
+	LPN__alphabetIndicator_latinAlphabetNo3	= 3,
+	LPN__alphabetIndicator_latinAlphabetNo4	= 4,
+	LPN__alphabetIndicator_latinCyrillicAlphabet	= 5,
+	LPN__alphabetIndicator_latinArabicAlphabet	= 6,
+	LPN__alphabetIndicator_latinGreekAlphabet	= 7,
+	LPN__alphabetIndicator_latinHebrewAlphabet	= 8,
+	LPN__alphabetIndicator_latinAlphabetNo5	= 9,
+	LPN__alphabetIndicator_latinAlphabetNo6	= 10,
+	LPN__alphabetIndicator_twoOctetBMP	= 11,
+	LPN__alphabetIndicator_fourOctetCanonical	= 12,
+	LPN__alphabetIndicator_reservedForUse1	= 13,
+	LPN__alphabetIndicator_reservedForUse2	= 14,
+	LPN__alphabetIndicator_reservedForUse3	= 15,
+	LPN__alphabetIndicator_reservedForUse4	= 16,
+	LPN__alphabetIndicator_reservedForUse5	= 17,
+	LPN__alphabetIndicator_reservedForUse6	= 18,
+	LPN__alphabetIndicator_reservedForUse7	= 19,
+	LPN__alphabetIndicator_reservedForUse8	= 20,
+	LPN__alphabetIndicator_reservedForUse9	= 21,
+	LPN__alphabetIndicator_reservedForUse10	= 22,
+	LPN__alphabetIndicator_reservedForUse11	= 23,
+	LPN__alphabetIndicator_reservedForUse12	= 24,
+	LPN__alphabetIndicator_reservedForUse13	= 25,
+	LPN__alphabetIndicator_reservedForUse14	= 26,
+	LPN__alphabetIndicator_reservedForUse15	= 27,
+	LPN__alphabetIndicator_reservedForUse16	= 28,
+	LPN__alphabetIndicator_reservedForUse17	= 29,
+	LPN__alphabetIndicator_reservedForUse18	= 30,
+	LPN__alphabetIndicator_reservedForUse19	= 31,
+	LPN__alphabetIndicator_reservedForUse20	= 32,
+	LPN__alphabetIndicator_reservedForUse21	= 33
+} e_LPN__alphabetIndicator;
+
+/* LPN */
+typedef struct LPN {
+	CountryCode_t	 countryCode;
+	long	 alphabetIndicator;
+	OCTET_STRING_t	 licencePlateNumber;
+	
+	/* Context for parsing across buffer boundaries */
+	asn_struct_ctx_t _asn_ctx;
+} LPN_t;
+
+/* Implementation */
+/* extern asn_TYPE_descriptor_t asn_DEF_alphabetIndicator_3;	// (Use -fall-defs-global to expose) */
+extern asn_TYPE_descriptor_t asn_DEF_LPN;
+extern asn_SEQUENCE_specifics_t asn_SPC_LPN_specs_1;
+extern asn_TYPE_member_t asn_MBR_LPN_1[3];
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif	/* _LPN_H_ */
+#include "asn_internal.h"