android: Fix black screen

[borongc]

Issue: 494590075

[github-actions]

🤖 Gemini Suggested Commit Message

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android: Fix black screen on older versions

On Android 11 and below, failing to detach child surfaces can cause
SurfaceView leaks and black screen issues because the OS does not
reliably clean them up. This change restricts the preservation of
child surface controls to Android 12 (API 31) and above, which
retains the fix for visible holes on newer systems while preventing
regressions on older hardware.

Bug: 494590075

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