soc/intel/apollolake: Wrap lines at 80 columns

Fix the following warning detected by checkpatch.pl:

WARNING: line over 80 characters

TEST=Build for reef

Change-Id: I4fbe95037ca4b52e64ba37e5c739af4a03f64feb
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: https://review.coreboot.org/18728
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

src/soc/intel/apollolake/bootblock/cache_as_ram.S

@@ -157,7 +157,7 @@ clear_var_mtrr:
 	mov	%eax, %ecx			/* save to ecx */
 	mov	$1, %ebx
 	shl	%cl, %ebx
-	sub	$1, %ebx			/* resulting mask is is in ebx */
+	sub	$1, %ebx		/* resulting mask is is in ebx */
 
 	/* Set this mask for initial cache fill */
 	mov	$MSR_L2_QOS_MASK(0), %ecx