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

This reverts commit e79f574ede98f380ac76cee116a6e1e197b37201.

Conflicts:
	packages/Keyguard/src/com/android/keyguard/KeyguardViewMediator.java
Fix missing lock screen camera key handler
Keyguard: LN: fix and harden against null pointer exceptions

Change-Id: Iff66791bb35b911e837b0a1747a72effdce507e3

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