Add support to MCUPM for mt8188

Vitor Sato Eschholzrequested to merge
vsatoes/mcupm into mtk-v2.8

Add support to MCUPM and DEVAPC for mt8188. Needed for cpufreq

RITA-1326

cc: @eblanc

Signed-off-by: Vitor Sato Eschholz vsatoes@baylibre.com

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