[BSC] Move the BTS-type specific code from bcs_init.c to bts_*.c

bsc_init.c was a big mess even only for two supported BTS models,
so before adding more BTS types, this needs a cleanup.

All the BTS specific code from bsc_init.c has now moved into
bts_{siemens_bs11,ipaccess_nanobts}.c

This has required that input_event() and nm_state_event() get both
converted to proper libosmocore signals instead of referencing external
symbols.
diff --git a/openbsc/include/openbsc/signal.h b/openbsc/include/openbsc/signal.h
index 8baada3..c583e94 100644
--- a/openbsc/include/openbsc/signal.h
+++ b/openbsc/include/openbsc/signal.h
@@ -47,6 +47,7 @@
 	SS_RF,
 	SS_MSC,
 	SS_HO,
+	SS_INPUT,
 };
 
 /* SS_PAGING signals */
@@ -81,6 +82,8 @@
 	S_NM_IPACC_RESTART_ACK, /* nanoBTS has send a restart ack */
 	S_NM_IPACC_RESTART_NACK,/* nanoBTS has send a restart ack */
 	S_NM_TEST_REP,		/* GSM 12.21 Test Report */
+	S_NM_STATECHG_OPER,	/* Operational State changed*/
+	S_NM_STATECHG_ADM,	/* Administrative State changed */
 };
 
 /* SS_LCHAN signals */
@@ -126,6 +129,7 @@
 
 enum signal_global {
 	S_GLOBAL_SHUTDOWN,
+	S_GLOBAL_BTS_CLOSE_OM,
 };
 
 /* SS_RF signals */
@@ -135,6 +139,13 @@
 	S_RF_GRACE,
 };
 
+/* SS_INPUT signals */
+enum signal_input {
+	S_INP_NONE,
+	S_INP_TEI_UP,
+	S_INP_TEI_DN,
+};
+
 struct gsm_subscriber;
 
 struct paging_signal_data {
@@ -158,6 +169,14 @@
 	u_int8_t msg_type;	
 };
 
+struct nm_statechg_signal_data {
+	u_int8_t obj_class;
+	void *obj;
+	struct gsm_nm_state *old_state;
+	struct gsm_nm_state *new_state;
+	struct abis_om_obj_inst *obj_inst;
+};
+
 struct nm_nack_signal_data {
 	struct msgb *msg;
 	uint8_t mt;
@@ -222,5 +241,9 @@
 	struct gsm_lchan *new_lchan;
 };
 
+struct input_signal_data {
+	int link_type;
+	struct gsm_bts_trx *trx;
+};
 
 #endif