draonboard: Remove obsolete debug.sf.no_hw_vsync usage am: f0859803aa am: 7e63670840 am: f235136fff am: 537d04088c

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

Change-Id: Ia796a11a99bda7752574c970aadc9db165d4c1c6