Revert "[WIP] LockScreen: allow long-press actions from hardware keys (1/2)"

Conflicts with SlimROM hardware key rebinding rendering this feature
non-reponsive. Revert for now till I find a solution.

This reverts commit b358c20721b13688d37bc43455ca8e738fb5af3c.

Conflicts:

	core/java/android/provider/Settings.java
	packages/Keyguard/src/com/android/keyguard/KeyguardViewManager.java