Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/s390/lib/xor.c b/arch/s390/lib/xor.c
index 9658059..29d9470 100644
--- a/arch/s390/lib/xor.c
+++ b/arch/s390/lib/xor.c
@@ -9,6 +9,7 @@
 #include <linux/types.h>
 #include <linux/export.h>
 #include <linux/raid/xor.h>
+#include <asm/xor.h>
 
 static void xor_xc_2(unsigned long bytes, unsigned long *p1, unsigned long *p2)
 {