Revert "BT: Multi HF support in Settings App."

This reverts commit 7bbd90528064516a4aae200731a7fd60acd09192.
Settings: Remove Wallpaper selection from Display

Let the launcher handle wallpaper selection.

Change-Id: I7f0eb20a5bc01d82fdb98905524b9743fee447c6
Signed-off-by: Roman Birg <roman@cyngn.com>
Settings: disable hardware unlock buttons while secure

Disable the unlock home/menu/camera options in settings
while a secure lockscreen is active to signal they do
not work to the user.

Change-Id: I193d253d40c7ceef80c6659b08d02be7159f476d
Signed-off-by: Roman Birg <roman@cyngn.com>