freedreno/a6xx: fix corrupted uniforms

freedreno/a6xx: fix corrupted uniforms

For older gen's fd_wfi() is used to conditionally insert a WFI if there
hasn't already been one since last draw.  But this doesn't work out well
with stateobj since the order the stateobj is evaluated might not be
what you expect.  (Ie. stateobj might not be evaluated until a later
draw if there is no geometry from the current draw in a given tile.)

Signed-off-by: Rob Clark <robdclark@gmail.com>