Handle night mode for notifications.

When the system detects a night mode change, it will reload the
resources and relayout the notifications.

Also, allow the text in the Notification to take night mode into
account. Add configuration to allow Android Auto embedded to not tint
certain elements of the UI.

Test: booted on phone and Android Auto headunit
Bug: 33210494
Change-Id: I261813e5795b047bdfc4f77b88e1b01cc72e3216