gprs: Improve loglevels and log messages for SGSN

Many log levels were DEBUG without any good reason. Also where possible
the details of the MM or PDP context are now logged with LOGMM/PDPCTXP.
diff --git a/openbsc/src/gprs/gprs_llc.c b/openbsc/src/gprs/gprs_llc.c
index 08a95b3..b157bfd 100644
--- a/openbsc/src/gprs/gprs_llc.c
+++ b/openbsc/src/gprs/gprs_llc.c
@@ -45,7 +45,7 @@
 
 	if (gprs_tlli_type(tlli) == TLLI_FOREIGN) {
 		new_tlli = tlli | 0x40000000;
-		DEBUGP(DLLC, "TLLI 0x%08x is foreign, converting to "
+		LOGP(DLLC, LOGL_NOTICE, "TLLI 0x%08x is foreign, converting to "
 			"local TLLI 0x%08x\n", tlli, new_tlli);
 	} else
 		new_tlli = tlli;
@@ -195,7 +195,7 @@
 		struct gprs_llc_llme *llme;
 		/* FIXME: don't use the TLLI but the 0xFFFF unassigned? */
 		llme = llme_alloc(tlli);
-		LOGP(DLLC, LOGL_DEBUG, "LLC RX: unknown TLLI 0x%08x, "
+		LOGP(DLLC, LOGL_NOTICE, "LLC RX: unknown TLLI 0x%08x, "
 			"creating LLME on the fly\n", tlli);
 		lle = &llme->lle[sapi];
 		return lle;
@@ -357,7 +357,7 @@
 		lle = lle_by_tlli_sapi(tlli_foreign2local(msgb_tlli(msg)), sapi);
 	if (!lle) {
 		struct gprs_llc_llme *llme;
-		LOGP(DLLC, LOGL_ERROR, "LLC TX: unknown TLLI 0x%08x, "
+		LOGP(DLLC, LOGL_NOTICE, "LLC TX: unknown TLLI 0x%08x, "
 			"creating LLME on the fly\n", msgb_tlli(msg));
 		llme = llme_alloc(msgb_tlli(msg));
 		lle = &llme->lle[sapi];