rspro_client_fsm: Add SRVC_E_DISCONNECT to disconnect from RSPRO server

This is in preparation of other patches which will actually issue the
SRVC_E_DISCONNET event towards this FSM.

Related: OS#4399
Change-Id: I080f9e85987bbbe7aef84c32ce84b69d949ff561
diff --git a/src/rspro_client_fsm.h b/src/rspro_client_fsm.h
index 2f3f7fc..c1ae764 100644
--- a/src/rspro_client_fsm.h
+++ b/src/rspro_client_fsm.h
@@ -8,6 +8,7 @@
 
 enum server_conn_fsm_event {
 	SRVC_E_ESTABLISH,	/* instruct SRVC to (re)etablish TCP connection to bankd */
+	SRVC_E_DISCONNECT,	/* instruct SRVC to disconnect TCP connection to bankd */
 	SRVC_E_TCP_UP,
 	SRVC_E_TCP_DOWN,
 	SRVC_E_KA_TIMEOUT,