graphics: swangle: Add debug.hwui.renderer=skiagl property am: fe72a3ce44 am: 7aeb8ea36e am: f831d758d5

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

Change-Id: I96aaafcf4564e82d09724e793bbbb67c01cc5f1e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>