rm references to lockscreen wallpapers

Change-Id: I4aa64b5fc13c3791f119ae3a11e5aa605eabc606

Cleanup un-used references

Change-Id: Ifc00f7cc745c48b67a4272c49b93835a807bb788

More Cleanup

Change-Id: I655a793dc2d10e7ab6caedc4f9dc0eb9c706f788