power: regulator: tps65941: Add TPS65224 PMIC regulator support

Reuse TPS65941 regulator driver to adds support for
TPS65224 PMIC's regulators. 4 BUCKs and 3 LDOs, where
BUCK1 and BUCK2 can be configured in dual phase mode.

Signed-off-by: Bhargav Raviprakash <bhargav.r@ltts.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>