cpu/intel/car/*/cache_as_ram.S: Add brackets around operand

Change-Id: I644c38c9b8383db25a970dc7a5ec8765980298ed
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/31291
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/cpu/intel/car/p4-netburst/cache_as_ram.S b/src/cpu/intel/car/p4-netburst/cache_as_ram.S
index f84e855..9d50582 100644
--- a/src/cpu/intel/car/p4-netburst/cache_as_ram.S
+++ b/src/cpu/intel/car/p4-netburst/cache_as_ram.S
@@ -304,7 +304,7 @@
 	/* Cache the whole rom to fetch microcode updates */
 	movl	$MTRR_PHYS_BASE(1), %ecx
 	xorl	%edx, %edx
-	movl	$CACHE_ROM_BASE | MTRR_TYPE_WRPROT, %eax
+	movl	$(CACHE_ROM_BASE | MTRR_TYPE_WRPROT), %eax
 	wrmsr
 
 	movl	$MTRR_PHYS_MASK(1), %ecx