regulator: rtmv20: Update DT binding document and property name parsing

1. Add vendor suffix to all proprietary properties.
2. Fix typo.
3. Change lsw to normal property, not pattern property.
4. Due to item 1, modify source code for property parsing.

Signed-off-by: ChiYuan Huang <cy_huang@richtek.com>
Link: https://lore.kernel.org/r/1601460480-4259-1-git-send-email-u0084500@gmail.com


Signed-off-by: Mark Brown <broonie@kernel.org>