naming: Distinguish "rspro client" from "remsim client"

"remsim-client" is the client program running next to a phone/modem
which is attaching to the SIM slot.

"RSPRO client" is a protocl-level client of the RSPRO protocol:
* the remsim-client connects as RSPRO client to the remsim-server
* the remsim-client connects as RSPRO client to the remsim-bankd
* the remsim-bankd connects as RSPRO client to the remsim-server

Let's clarify this in naming.

Change-Id: I10462d4669a0a30c46f3f8d3df67e9c1d4ce8c4b
diff --git a/src/bankd_main.c b/src/bankd_main.c
index 13e2b88..23a1c78 100644
--- a/src/bankd_main.c
+++ b/src/bankd_main.c
@@ -27,7 +27,7 @@
 #include <osmocom/rspro/RsproPDU.h>
 
 #include "bankd.h"
-#include "remsim_client_fsm.h"
+#include "rspro_client_fsm.h"
 #include "debug.h"
 #include "rspro_util.h"