Fix V2 for APN

Change-Id: I936f6f3cb99cdfb2c28765e1229ddac29eab6e87
diff --git a/mbtk/libmbtk_ril_v2/inc/mbtk_ril.h b/mbtk/libmbtk_ril_v2/inc/mbtk_ril.h
index e32b1dd..04b5623 100755
--- a/mbtk/libmbtk_ril_v2/inc/mbtk_ril.h
+++ b/mbtk/libmbtk_ril_v2/inc/mbtk_ril.h
@@ -11,7 +11,7 @@
 
 #define RIL_SOCK_PACKET_TAG 0x5F6F7F8F
 #define RIL_SOCK_NAME "/tmp/mbtk_ril_sock"
-#define RIL_SOCK_MSG_LEN_MAX 2048
+#define RIL_SOCK_MSG_LEN_MAX (1024 * 6)
 
 // Tag(4) + Packet_Length(2)
 #define RIL_SOCK_PACK_EXTRA_LEN 6