Add new Card Unavailable reason for SIM power down in APM.

REASON_APM_SIM_POWER_DOWN value added to CardUnavailableReason enum.
This is to indicate card absent event received when SIM is powered
down in APM.

Change-Id: I985e06d629715ebc0489a2fb19e908ab652bfeeb
CRs-Fixed: 661325
Move 3rd party wallpaper pickers to the front

This is a feature request from Steve so here you go!

Change-Id: Iac6a26c7b51752d65026a871712c3590caa926d9
Include default wallpaper in LockscreenWallpaperPickerActivity

Change-Id: I0e3d46688bdb257bc32e10d9255dfc4fbf7beb4c
Add navbar background preview to ThemesContract

Change-Id: Id3ed43c86649b1757fec7f3fc7dee2d2730258e2
Proximity : Check proximity flags only if from native

Change-Id: Id1be619e638de6a45252d8390eab6e38bd5de5a7