Only supports ambient mode when necessary.

We only need support ambient mode on specified devices but we currently
enable this attribute on all devices, that means we need redraw every
time when ambient mode changes. However, we can just show / hide
wallpaper window on the devices which not support ambient transition.

In addition, always use portrait dimension as scissor area since we only
do transition in portrait.

Bug: 138021396
Bug: 137962047
Test: Manually test on F2, C1, B4, S4 and walleye.
Test: Set an image wallpaper, switch between home, aod and lockscreen.
Test: Also use finger print to unlock from aod to home directly.
Test: Rotate to landscape, set a new image wallpaper.
Test: Switch between home, aod and lockscreen.
Change-Id: I36dd49363e81df5a260b10695d90aa9d8c70a45a