Allow homescreen widgets on the lockscreen (1/2)

Change-Id: I8ecdd0e3f3ec008435bc637373ec923422211da9

(cherry picked from commit dc7dee27a7e758e9da072ae864803e04efe37415)

Conflicts:
	core/java/android/provider/Settings.java
	policy/src/com/android/internal/policy/impl/keyguard/KeyguardActivityLauncher.java
don't disable lockscreen widgets on low memory devices (1/2)

Change-Id: I4ed76e259d156be43b85645e1473f35b762f18d7
(cherry picked from commit 70be95419dce92637673b8e93f3f88058b791992)
(cherry picked from commit fc18f0d3daee6166dd998d9c26bc8d5ead172b6f)