regulator: rt5190a: Add support for Richtek RT5190A PMIC

Add support for Richtek RT5190A PMIC.

Signed-off-by: ChiYuan Huang <cy_huang@richtek.com>
Link: https://lore.kernel.org/r/1646812903-32496-3-git-send-email-u0084500@gmail.com


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