pcu_if: implement support for 3-digit MNC

Add the mnc_3_digits member to the info_ind.

Instead of changing to e.g. osmo_plmn_id, add the flag separately, and instead
of bool use a uint8_t, to not raise any struct packing issues and clarify the
flag's size beyond any doubt.

Bump the PCU interface version to 9.
This is one part of the three identical pcuif_proto.h patches:
- I49cd762c3c9d7ee6a82451bdf3ffa2a060767947 (osmo-bts)
- I787fed84a7b613158a5618dd5cffafe4e4927234 (osmo-pcu)
- I78f30aef7aa224b2e9db54c3a844d8f520b3aee0 (osmo-bsc)

Depends: Id2240f7f518494c9df6c8bda52c0d5092f90f221 (libosmocore)
Change-Id: I78f30aef7aa224b2e9db54c3a844d8f520b3aee0
diff --git a/include/osmocom/bsc/pcuif_proto.h b/include/osmocom/bsc/pcuif_proto.h
index ced783e..b9f61b6 100644
--- a/include/osmocom/bsc/pcuif_proto.h
+++ b/include/osmocom/bsc/pcuif_proto.h
@@ -3,7 +3,7 @@
 
 #include <osmocom/gsm/l1sap.h>
 
-#define PCU_IF_VERSION		0x08
+#define PCU_IF_VERSION		0x09
 #define TXT_MAX_LEN	128
 
 /* msg_type */
@@ -120,7 +120,9 @@
 	struct gsm_pcu_if_info_trx trx[8];	/* TRX infos per BTS */
 	uint8_t		bsic;
 	/* RAI */
-	uint16_t	mcc, mnc, lac, rac;
+	uint16_t	mcc, mnc;
+	uint8_t		mnc_3_digits;
+	uint16_t	lac, rac;
 	/* NSE */
 	uint16_t	nsei;
 	uint8_t		nse_timer[7];