hwc: Handle DOZE_SUSPEND properly

DOZE_SUSPEND is the lowest power state with the display still on.
With DOZE, we can still have updates. With DOZE_SUSPEND, MDP
clocks are off and no update can happen. This is applicable only for
wearables and doesn't happen in doze in handhelds/tablets.

Change-Id: I10fe467a099ead3b0b56a01fec0fb18e1ad78580
1 file changed