cosmetic: gsup comments: write 'Generic' for the G in GSUP

The G used to mean GPRS, but the scope is larger now. To satisfy the curious
reader, give the G a name in gsup files' header comments. BTW, logging.h and
gsup_test.c already mentioned "Generic" before this.

Change-Id: I6ac5cf94c215e156ceff6a58da3d9e520ca942d9
diff --git a/include/osmocom/gsm/gsup.h b/include/osmocom/gsm/gsup.h
index 636a112..e2912a6 100644
--- a/include/osmocom/gsm/gsup.h
+++ b/include/osmocom/gsm/gsup.h
@@ -1,4 +1,4 @@
-/* Osmocom Subscriber Update Protocol message encoder/decoder */
+/* Osmocom Generic Subscriber Update Protocol message encoder/decoder */
 
 /* (C) 2014 by sysmocom s.f.m.c. GmbH, Author: Jacob Erlbeck
  * (C) 2016 by Harald Welte <laforge@gnumonks.org>
diff --git a/src/gsm/gsup.c b/src/gsm/gsup.c
index b213e30..22f57ab 100644
--- a/src/gsm/gsup.c
+++ b/src/gsm/gsup.c
@@ -1,4 +1,4 @@
-/* Osmocom Subscriber Update Protocol message encoder/decoder */
+/* Osmocom Generic Subscriber Update Protocol message encoder/decoder */
 
 /*
  * (C) 2014 by sysmocom s.f.m.c. GmbH