make rbs_sabm compile against modern libosmocore

rbs_lapd/rbs_sabm.c

@@ -6,7 +6,7 @@
 
 #include <dahdi/user.h>
 
-#include <osmocore/utils.h>
+#include <osmocom/core/utils.h>
 
 /* this program wants to be called with 'strace -s1024 -x' so you see the data
  * betewen DAHDI and it */
@@ -49,7 +49,7 @@ static void dummy_read(int fd, unsigned int len)
 	if (rc == -1)
 		handle_dahdi_exception(fd);
 	else if (rc > 0)
-		printf("Received %u bytes (%s)\n", rc, hexdump(dummy_buf, rc));
+		printf("Received %u bytes (%s)\n", rc, osmo_hexdump(dummy_buf, rc));
 }
 
 int main(int argc, char **argv)