Allow Power-button to temporarily ignore proximity sensor.

If a device has an active proximity wakelocks while proximity
is in the "near" state, a press of the power button will temporarily
ignore proximity sensor allowing the screen to turn back on.
It will stop being ignored where there is a change to the
proximity sensor state.

Bug: 162443904
Test: atest PowerManagerServiceTests, atest DisplayManagerTests
Change-Id: I2656cca3e643e278cd5e5fedc2d74d9cbca82c2b