Fix build of bsc-nat and GPRS code after include path change

The last patch changed the osmocore include paths, this fixes some build
problems caused by it
diff --git a/openbsc/src/osmo-bsc_nat/bsc_nat_utils.c b/openbsc/src/osmo-bsc_nat/bsc_nat_utils.c
index 6068333..f83289b 100644
--- a/openbsc/src/osmo-bsc_nat/bsc_nat_utils.c
+++ b/openbsc/src/osmo-bsc_nat/bsc_nat_utils.c
@@ -31,9 +31,9 @@
 
 #include <osmocom/core/linuxlist.h>
 #include <osmocom/core/talloc.h>
-#include <osmocom/core/gsm0808.h>
+#include <osmocom/gsm/gsm0808.h>
 
-#include <osmocom/core/protocol/gsm_08_08.h>
+#include <osmocom/gsm/protocol/gsm_08_08.h>
 
 #include <osmocom/sccp/sccp.h>