Allow multiple bts objects in PCU

This patch doesn't really tests whether osmo-pcu can work on a multi-bts
environment, but it prepares the data structures to be able to do so at
any later point in time.

Change-Id: I6b10913f46c19d438c4e250a436a7446694b725a
diff --git a/src/gprs_rlcmac.h b/src/gprs_rlcmac.h
index a5d1d30..69fd6a4 100644
--- a/src/gprs_rlcmac.h
+++ b/src/gprs_rlcmac.h
@@ -113,7 +113,7 @@
 int alloc_algorithm_dynamic(struct gprs_rlcmac_bts *bts, struct GprsMs *ms, struct gprs_rlcmac_tbf *tbf, bool single,
 			    int8_t use_trx);
 
-int gprs_rlcmac_paging_request(const struct osmo_mobile_identity *mi, uint16_t pgroup);
+int gprs_rlcmac_paging_request(struct gprs_rlcmac_bts *bts, const struct osmo_mobile_identity *mi, uint16_t pgroup);
 int gprs_alloc_max_dl_slots_per_ms(const struct gprs_rlcmac_bts *bts, uint8_t ms_class);
 #ifdef __cplusplus
 }