Preventing global config change from windowless starting window.

The configuration we used to create WindowlessWindowManager can affects
outMergedConfiguration when relayout called, if that config did align
to the process, there can trigger VRI#performConfigurationChange and
send the global configuration change by sConfigCallbacks.

Provide a short term solution so when drawing windowless starting window
for embedded activity, the configuration won't affects the entire
process.

Flag: EXEMPT bugfix
Bug: 351763151
Test: verify the created windowless starting surface for embedded activity
won't affect SystemUI's configuration.

Change-Id: I248d7ebfdfddbc733d61d3d9540c72a998b60807