Revert "PWM: disable HW overlays for PIE"

This reverts commit e093162ca84c01f40327aae1b7934661508af9b9.

Conflicts:
	policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
Revert "PWM: check for expanded desktop on boot"

This reverts commit 0c17ce672fd93b6ba0a35043ece65092f55dcbbb.

Conflicts:
	policy/src/com/android/internal/policy/impl/PhoneWindowManager.java