drivers: clock_control: More power supply modes for STM32H7

STM32H7 has different power supply modes but now Zephyr supports just LDO
and direct SMPS. This commit introduses POWER_SUPPLY_CHOICE configuration
parameter and add support for missed power supply modes.

Signed-off-by: Gennady Kovalev <gik@bigur.com>

Fixes #40730.
3 files changed