feat(mt8188): add RTC support

TEST=build pass.
BUG=b:233720142

Signed-off-by: Song Fan <ot_song.fan@mediatek.corp-partner.google.com>
Change-Id: I348eff0f53341593f74a63780e2e8298cbc3ec88

refator(mediatek): move drivers folder in common to plat/mediatek

We plan to put some soc related drivers in common/drivers. To reduce
confision, we move them to plat/mediatek.

Signed-off-by: Bo-Ch

refator(mediatek): move drivers folder in common to plat/mediatek

We plan to put some soc related drivers in common/drivers. To reduce
confision, we move them to plat/mediatek.

Signed-off-by: Bo-Chen Chen <rex-bc.chen@mediatek.com>
Change-Id: I6b344e660f40a23b15151aab073d3045b28f52aa

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