graphics: swangle: Add debug.hwui.renderer=skiagl property am: fe72a3ce44

Original change: https://android-review.googlesource.com/c/device/linaro/dragonboard/+/2785049

Change-Id: I0aa07eaa0338db14e24aaf6f6a0efd1d5cbacd83
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>