draonboard: Remove obsolete debug.sf.no_hw_vsync usage am: f0859803aa am: 7e63670840 am: f235136fff

Original change: https://android-review.googlesource.com/c/device/linaro/dragonboard/+/1843074

Change-Id: I4ba9f66b78d21dc6b3301329b7d6719ab75d0a2d