Add GSI overlay for SystemUI

Use runtime resource overlay to override SystemUI resources
in case some legacy devices might have invalid settings,
and the invalid settings might cause unexpected SystemUI
errors when installing GSI on different devices.

Bug: 245806899
Test: Build and install GSI on Pixel
Change-Id: I704ba8f1a4a1d058e5e992d3ca18bdb4bda6610d