mt8173: update spm suspend pcm codes
1. update suspend pcm code (add dummy apb read before mcusys power down)
BRANCH=none
BUG=none
TEST=verified
Change-Id: I2802cf8665fc1c8fe2304fd7d5f3eab9948b0b78
Signed-off-by: yt.lee <yt.lee@mediatek.com>
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