remove our own framing.c implemmentation in favor of Linux one

The Qualcomm Linux kernel has a HDLC encoder/decoder, let's use that one
rather than our own implementation.
diff --git a/src/config.c b/src/config.c
index 237eb82..916cb05 100644
--- a/src/config.c
+++ b/src/config.c
@@ -2,7 +2,7 @@
 #include <osmocom/core/msgb.h>
 
 #include "diagcmd.h"
-#include "framing.h"
+#include "protocol.h"
 
 enum log_config_op {
 	LOG_CONFIG_DISABLE_OP			= 0,
@@ -27,7 +27,7 @@
 
 struct msgb *gen_log_config_set_mask(uint32_t equip_id, uint32_t last_item)
 {
-	struct msgb *msg = msgb_alloc(MAX_PACKET, "Diag Tx");
+	struct msgb *msg = msgb_alloc(DIAG_MAX_REQ_SIZE, "Diag Tx");
 	struct diag_log_config_set_mask *dlcsm;
 	uint8_t *mask;