drivers: regulator: shell: drop PMIC conditional options
drivers: regulator: shell: drop PMIC conditional options

The regulator API supports all voltage/current ops, so there's no need
to guard them under "PMIC". If a particular driver doesn't support the
operations it will just return -ENOSYS and the command will fail.

Signed-off-by: Gerard Marull-Paretas <bedb45f43a286e49f4dcda039a436b216ae61ef3@nordicsemi.no>

galak/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,galak/zephyr