Dispatch overlay change to WindowManager

This works around an issue where changes to runtime resource overlays
are not dispatched to WindowManager, and it therefore never updates
the overlay-dependent resources.

Bug: 65689439
Test: adb shell cmd overlay enable com.android.internal.display.cutout.emulation; then check that status bar size changed properly
Change-Id: If78a1dde283e39a977ff3f8ead7c3576129dfede