freedreno/drm: Fix ring_heap flags
What does this MR do and why?
freedreno/drm: Fix ring_heap flags
RING_FLAGS has FD_BO_HINT_COMMAND so we can't mask out the _FD_BO_HINTS.
Fixes: a3fb2b07aa29 ("freedreno: Add bo usage hints")
Signed-off-by: Rob Clark <robdclark@chromium.org>