pmdomain: arm_scmi: Move Kconfig options to the pmdomain subsystem

The Kconfig options belongs closer to the corresponding implementations,
hence let's move them from the firmware to the pmdomain subsystem.

Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Link: https://lore.kernel.org/r/20231123120847.2825444-1-sudeep.holla@arm.com


Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>