regulator: rtmv20: Add missing regcache cache only before marked as dirty

Add missing regcache cache only before masked as dirty.

Signed-off-by: ChiYuan Huang <cy_huang@richtek.com>
Link: https://lore.kernel.org/r/1601461132-15251-1-git-send-email-u0084500@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
1 file changed