FROMGIT: power: reset: sc27xx: Allow the SC27XX poweroff driver building into a module

Change the config to 'tristate' and use module_platform_driver() to
allow the SC27XX poweroff driver building into a module, as well as
adding some mudule information.

bug: 146864653
Signed-off-by: Baolin Wang <baolin.wang7@gmail.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
(cherry picked from commit f78c55e3b4806974f7d590b2aab8683232b7bd25
https://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply.git for-next)