include: reorganize headers file to include/osmocom/[gsm|core]

This patch moves all GSM-specific definitions to include/osmocom/gsm.
Moreover, the headers in include/osmocore/ have been moved to
include/osmocom/core.

This has been proposed by Harald Welte and Sylvain Munaunt.

Tested with `make distcheck'.

Signed-off-by: Pablo Neira Ayuso <pablo@gnumonks.org>
diff --git a/src/vty/logging_vty.c b/src/vty/logging_vty.c
index 1b356c9..4cab22a 100644
--- a/src/vty/logging_vty.c
+++ b/src/vty/logging_vty.c
@@ -24,9 +24,9 @@
 
 #include "../../config.h"
 
-#include <osmocore/talloc.h>
-#include <osmocore/logging.h>
-#include <osmocore/utils.h>
+#include <osmocom/core/talloc.h>
+#include <osmocom/core/logging.h>
+#include <osmocom/core/utils.h>
 
 //#include <openbsc/vty.h>