Fix immersive mode for seahawk_car_ui_portrait

config_remoteInsetsControllerControlsSystemBars field is not read
correctly on seahawk_car_ui_portrait due to the rro kicks in after
InsetPolicy init.
So update it in DisplayPolicy#onConfigurationChanged

Bug: 270747068
Test: atest InsetsPolicyTest
Change-Id: I8276ae9e73dc3df15fd403b39cc9647ef04d3d6e