configs: rockchip: radxa-cm3-io, rock-3a: enable commands for i2c/pmic/regulator

enable commands for i2c/pmic/regulator and relevant configs.
also drop configs for unused regulators.

Signed-off-by: FUKAUMI Naoki <naoki@radxa.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
2 files changed