Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/arm64/kernel/smccc-call.S b/arch/arm64/kernel/smccc-call.S
index 6252234..5465527 100644
--- a/arch/arm64/kernel/smccc-call.S
+++ b/arch/arm64/kernel/smccc-call.S
@@ -1,19 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
  * Copyright (c) 2015, Linaro Limited
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License Version 2 as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
  */
 #include <linux/linkage.h>
 #include <linux/arm-smccc.h>
+
 #include <asm/asm-offsets.h>
+#include <asm/assembler.h>
 
 	.macro SMCCC instr
 	.cfi_startproc
@@ -40,6 +33,7 @@
 ENTRY(__arm_smccc_smc)
 	SMCCC	smc
 ENDPROC(__arm_smccc_smc)
+EXPORT_SYMBOL(__arm_smccc_smc)
 
 /*
  * void arm_smccc_hvc(unsigned long a0, unsigned long a1, unsigned long a2,
@@ -50,3 +44,4 @@
 ENTRY(__arm_smccc_hvc)
 	SMCCC	hvc
 ENDPROC(__arm_smccc_hvc)
+EXPORT_SYMBOL(__arm_smccc_hvc)