arch/arm/armv7: Correct checkpatch errors

- Correct whitespace issues with files under arch/arm/armv7.
- Fix comments and remove unnecessary line continuations in mmu.c

Change-Id: I69d50030b07b1919555feca44967472922176a81
Signed-off-by: Logan Carlson <logancarlson@google.com>
Reviewed-on: https://review.coreboot.org/19996
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Martin Roth <martinroth@google.com>

src/arch/arm/armv7/cache.c

@@ -84,7 +84,7 @@ static void dcache_op_mva(void const *addr, size_t len, enum dcache_op op)
 
 	dsb();
 	while ((void *)line < addr + len) {
-		switch(op) {
+		switch (op) {
 		case OP_DCCIMVAC:
 			dccimvac(line);
 			break;