regmap: cache: Step by stride in default sync

The default sync operation was still assuming a stride of one, fix it
to respect the reg_stride set in the map.

Signed-off-by: Dylan Reid <dgreid@chromium.org>
Signed-off-by: Mark Brown <broonie@linaro.org>

drivers/base/regmap/regcache.c

@@ -249,7 +249,7 @@ static int regcache_default_sync(struct regmap *map, unsigned int min,
 {
 	unsigned int reg;
 
-	for (reg = min; reg <= max; reg++) {
+	for (reg = min; reg <= max; reg += map->reg_stride) {
 		unsigned int val;
 		int ret;