Remove rest_octets.h

The MSC should not fiddle with low-level SI details like rest octets
anyway. Unfortunately simply removing the header is impossible as it
causes massive fallout due to missing includes. Fixed it as well.

The only other parameter which required removal is cell_ro_sel_par which
is not referenced anywhere in the code anyway.

Change-Id: Ibff77330de056fad4288cd4c48d016aad8105354
diff --git a/src/libmsc/ussd.c b/src/libmsc/ussd.c
index e3263d2..7b450a2 100644
--- a/src/libmsc/ussd.c
+++ b/src/libmsc/ussd.c
@@ -34,6 +34,7 @@
 #include <osmocom/msc/debug.h>
 #include <osmocom/msc/osmo_msc.h>
 #include <osmocom/msc/vlr.h>
+#include <osmocom/msc/gsm_04_08.h>
 
 /* Declarations of USSD strings to be recognised */
 const char USSD_TEXT_OWN_NUMBER[] = "*#100#";