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

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

Change-Id: I7c88472828a6890e614c1cd1994274dab882665e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>