arm: Fix armv8 compilation error

Fix following compilation error when CONFIG_ARM64 is defined

Error: unknown or missing system register name at operand 2
-- `mrs x0,daifmsr daifset,#3'

Signed-off-by: Shaibal.Dutta <shaibal.dutta@broadcom.com>
Signed-off-by: Darwin Rambo <drambo@broadcom.com>
Reviewed-by: Darwin Rambo <drambo@broadcom.com>

arch/arm/include/asm/proc-armv/system.h

@@ -22,7 +22,7 @@
 #define local_irq_save(flags)					\
 	({							\
 	asm volatile(						\
-	"mrs	%0, daif"					\
+	"mrs	%0, daif\n"					\
 	"msr	daifset, #3"					\
 	: "=r" (flags)						\
 	:							\