feat(plat/mediatek/mt8186): add pinctrl support

Add MT8186 pinctrl support.

TEST=build pass
BUG=b:202871018

Signed-off-by: Guodong Liu <guodong.liu@mediatek.corp-partner.google.com>
Change-Id: I5b9c1c60a91c74c7d3f45c78a9403544373fa90f
5 files changed