Don't update lock icon location based on rotation

On the keyguard, the orientation is always portrait, even when the
rotation of the device doesn't indicate portrait. Previously, the
location of the lock icon was updated based on rotation and was
offscreen. Instead, don't update based on orientation.

Test: manual
Fixes: 187470345
Change-Id: Ie7355fddfef32c6c75d91a1e9da8b49fb301dc93