Revert "Keyguard: allow keyguard to be dismissed via intent"

This reverts commit e79f574ede98f380ac76cee116a6e1e197b37201.

Conflicts:
	packages/Keyguard/src/com/android/keyguard/KeyguardViewMediator.java

Conflicts:
	packages/Keyguard/src/com/android/keyguard/KeyguardViewMediator.java