msm: scm: Mark inline asm as volatile

We don't want the compiler to remove these asm statements or
reorder them in any way. Mark them as volatile to be sure.
Signed-off-by: NStephen Boyd <sboyd@codeaurora.org>
Acked-by: NWill Deacon <will.deacon@arm.com>
Signed-off-by: NDavid Brown <davidb@codeaurora.org>

arch/arm/mach-msm/scm.c

@@ -174,7 +174,7 @@ static u32 smc(u32 cmd_addr)
 	register u32 r0 asm("r0") = 1;
 	register u32 r1 asm("r1") = (u32)&context_id;
 	register u32 r2 asm("r2") = cmd_addr;
-	asm(
+	asm volatile(
 		__asmeq("%0", "r0")
 		__asmeq("%1", "r0")
 		__asmeq("%2", "r1")
@@ -271,7 +271,7 @@ u32 scm_get_version(void)
 		return version;
 
 	mutex_lock(&scm_lock);
-	asm(
+	asm volatile(
 		__asmeq("%0", "r1")
 		__asmeq("%1", "r0")
 		__asmeq("%2", "r1")