CHROMIUM: soc: mediatek: pm-domains: Add domain regulator supply to 8192

MFG0 power domain requires an extra power supply on mt8192.

BUG=b:178776793
TEST=boot asurada and check display

[Similar patch is being upstreamed for 8183, we can wait for that
to land upstream, then upstream this as well]

Change-Id: I01f46bed82d927ea5871a15dc47e4d9093354f30
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/2699573


Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>
Commit-Queue: Nicolas Boichat <drinkcat@chromium.org>
Tested-by: Nicolas Boichat <drinkcat@chromium.org>