Remove app switch behaviour

This behaviour is no longer relevant and poorly documented. It is also untested.
Introduce a flag to remove it.

Bug: 284808102
Test: TEST=inputflinger_tests; m $TEST && $ANDROID_HOST_OUT/nativetest64/$TEST/$TEST
Change-Id: I303fbbb76e8b21f2d4657ae24e39e38d07bcd817
2 files changed