Initial handling support for RIM messages

This code doesn't do anything yet app-related with the received RIM
messages, but already provides the initial infrastructure to handle them
in the future, and does first checkings.

Related: SYS#5103
Change-Id: Ia0ade0e97ea781ec655439c008b6cefaf3e90dec
diff --git a/src/gprs_debug.h b/src/gprs_debug.h
index 84a0a07..8df405a 100644
--- a/src/gprs_debug.h
+++ b/src/gprs_debug.h
@@ -46,6 +46,7 @@
 	DTBFUL,
 	DNS,
 	DPCU,
+	DRIM,
 	aDebug_LastEntry
 };