Mitigate the security vulnerability by sanitizing the transaction flags.

- This is part of fix of commit
  Id9d9012d4ede9c8330f0ce1096bcb78e51b7c5df for backporting.

Bug: 248031255
Test: test using displaytoken app manually on the phone, test shell
screenrecord during using displaytoken; atest
android.hardware.camera2.cts.FastBasicsTest

Change-Id: Id9d9012d4ede9c8330f0ce1096bcb78e51b7c5df
Merged-In: Id9d9012d4ede9c8330f0ce1096bcb78e51b7c5df
(cherry picked from commit 3ea58dbc)
Merged-In: Id9d9012d4ede9c8330f0ce1096bcb78e51b7c5df