mt8173: Reorganize plat SiP functions
Jimmy Huang authored
Due to the changes in Mediatek platform common code, we need to move
plat related SiP functions to plat folder.

Change-Id: I6b14b988235205a5858b4bf49043bc79d0512b06
Signed-off-by: default avatarJimmy Huang <jimmy.huang@mediatek.com>
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