requested to merge matteo.franchin.arm/drm-hwcomposer:presentdisplay_fix into master
DrmHwcTwo::HwcDisplay::PresentDisplay was always returning -1 as the present fence. This commits ensures the fence fd is correctly retrieved after doing the commit-frame operation. It also updates outdated logic that caused PresentDisplay to return the retire fence rather than the present fence.
Signed-off-by: Matteo Franchin email@example.com