graphics: swangle: Add debug.hwui.renderer=skiagl property am: fe72a3ce44 am: 16d6b4a0fa

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

Change-Id: I86087a59f4c44a08b764cb2ead1735ef8bd1a332
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>