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Add Suspend to RAM (S3) support

Vitor Sato Eschholz requested to merge vsatoes/RITA-1216 into mtk-v2.8

Add Suspend to RAM support.

Test:

#Disable vpu/apu
echo stop > sys/class/remoteproc/remoteproc0/state

#Put into S3
echo mem > /sys/power/state

#Wake up using volume up button

#Set wakealarm to 5 seconds
echo $(( `date '+%s'` +5 )) > /sys/class/rtc/rtc0/wakealarm

#Put intto S3
echo mem > /sys/power/state

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

Closes RITA-1216

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