logging.h: fixup: shorter names for LOGGING_FILTER_* and LOGGING_CTX_*

My recent logging patch was merged to master a bit too soon. Accomodate the
request for naming that matches the general "LOG" prefix instead of "LOGGING".

libosmocore will not be backwards-compatible with the few commits from
change-id I5c343630020f4b108099696fd96c2111614c8067 up to this one. This and
following commits are backwards compatible with those before that short window.

See also:
* openbsc change-id Ib2ec5e4884aa90f48051ee2f832af557aa525991
* osmo-pcu change-id I4db4a668f2be07f3d55f848d38d1b490d8a7a685

Change-Id: I424fe3f12ea620338902b2bb8230544bde3f1a93
diff --git a/src/gb/gprs_bssgp_vty.c b/src/gb/gprs_bssgp_vty.c
index d8fc840..f3f354c 100644
--- a/src/gb/gprs_bssgp_vty.c
+++ b/src/gb/gprs_bssgp_vty.c
@@ -47,11 +47,11 @@
 				struct bssgp_bvc_ctx *bctx)
 {
 	if (bctx) {
-		target->filter_map |= (1 << LOGGING_FILTER_GB_BVC);
-		target->filter_data[LOGGING_FILTER_GB_BVC] = bctx;
-	} else if (target->filter_data[LOGGING_FILTER_GB_BVC]) {
-		target->filter_map = ~(1 << LOGGING_FILTER_GB_BVC);
-		target->filter_data[LOGGING_FILTER_GB_BVC] = NULL;
+		target->filter_map |= (1 << LOG_FLT_GB_BVC);
+		target->filter_data[LOG_FLT_GB_BVC] = bctx;
+	} else if (target->filter_data[LOG_FLT_GB_BVC]) {
+		target->filter_map = ~(1 << LOG_FLT_GB_BVC);
+		target->filter_data[LOG_FLT_GB_BVC] = NULL;
 	}
 }