Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/include/uapi/linux/igmp.h b/include/uapi/linux/igmp.h
index 7e44ac0..90c28bc 100644
--- a/include/uapi/linux/igmp.h
+++ b/include/uapi/linux/igmp.h
@@ -93,6 +93,7 @@
 #define IGMP_MTRACE_RESP		0x1e
 #define IGMP_MTRACE			0x1f
 
+#define IGMP_MRDISC_ADV			0x30	/* From RFC4286 */
 
 /*
  *	Use the BSD names for these for compatibility