Introduce a restorecon JNI binding.

Label the vmdl.*\.tmp files and the final .apk file differently.
Modify the WallpaperManagerService to restorecon the wallpaper file.

Signed-off-by: rpcraig <rpcraig@tycho.ncsc.mil>

Change-Id: Idfc056e9ec0508d7e11100626a7114f341f1af70