Reset the touch state when the active viewport is disabled

When an active viewport becomes inactive, cancel any ongoing gestures
immediately. When the viewport becomes active again, make sure state is
reset again so that we eliminate any race conditions between the
viewport becoming active and first touches coming in from the device.

This is a preventative measure to defend against unexpected touch
behavior around viewports being activated and deactivated.

Bug: 234662773
Test: atest inputflinger_tests
Change-Id: I111361f7470fdad39b493b516e8a8f167e0c681c