cleanup: Remove code that is provided by libosmocore now.

libosmocore contains the GSM08.08 definition, no need to copy
that anymore.
diff --git a/src/bss_patch.c b/src/bss_patch.c
index 5994b9e..88280e2 100644
--- a/src/bss_patch.c
+++ b/src/bss_patch.c
@@ -25,8 +25,9 @@
 
 #include <string.h>
 
-#include <openbsc_nat/bssap.h>
-#include <openbsc_nat/tlv.h>
+#include <osmocore/gsm0808.h>
+#include <osmocore/protocol/gsm_08_08.h>
+
 #include <osmocom/sccp/sccp.h>
 
 #include <arpa/inet.h>