panfrost/midgard: Hit missed scheduling opportunity

panfrost/midgard: Hit missed scheduling opportunity

Don't try to schedule to vmul when that can't possible work (forcing a
bundle break). glmark:

total bundles in shared programs: 2700 -> 2683 (-0.63%)
bundles in affected programs: 695 -> 678 (-2.45%)
helped: 14
HURT: 0
helped stats (abs) min: 1 max: 4 x̄: 1.21 x̃: 1
helped stats (rel) min: 1.27% max: 7.69% x̄: 4.30% x̃: 4.77%
95% mean confidence interval for bundles value: -1.68 -0.75
95% mean confidence interval for bundles %-change: -5.63% -2.97%
Bundles are helped.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>