arm64: defconfig: enable MT6357 regulator

Enable the power regulator support of MediaTek MT6357 PMIC. This driver
supports the control of different power rails of device through
regulator interface.

Tested-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Alexandre Mergnat <amergnat@baylibre.com>
Link: https://lore.kernel.org/r/20230203-evk-board-support-v8-1-7019f3fd0adf@baylibre.com


Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>