[1/2] Base: Lockscreen blur enhancements

Changed base for lockscreen blur to AOSPAL.

Thanks to Kyrylo Mikos <kiril.mik.os@gmail.com>
for smooth background change patch.

Settings: https://gerrit.omnirom.org/#/c/5706/

Change-Id: I9bf0f37b99d2277f1e62c3a108ad51c5e340b711