Fix AOD flicker on certain devices

On some devices, both AOD doze triggers and the normal Udfps overlay touch get reported. This causes duplicate down events that can cause flickering. Add a check if the aodInterrupt is still active before registering a new down event.

Bug: 345411027
Test: atest UdfpsControllerTest
Flag: EXEMPT bugfix
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:7efc1c3faba98e7b94b5f6fc2523f3503262b2c1)
Merged-In: Ic6644ccafa4bb63b83930491ce18d14f2db6db22
Change-Id: Ic6644ccafa4bb63b83930491ce18d14f2db6db22