[automerger skipped] Revert "Make BT709 support conditional on swapchain ext enable" am: e91bd149 -s ours

am skip reason: Merged-In Id056873193a711de140acb2f1dfd4a734ecaec4b with SHA-1 e4f0f736 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/17199451

Change-Id: I976485a1c1e473440ce3b18f9a33cf711acf3f95