Revert "Introduce system shortcut key unit tests"

This reverts commit 1c70dfaed49cf6e039a83fe7706b3ec78d0b7594.

Reason for revert: Broke powermenu test

Bug: 242031003
Change-Id: I6445da870563a929bb82382aecd1f4a2ba5661e2
6 files changed