pan/midgard: Add blend shader selection bits for MRT

This is less complicated than previously thought. Note we have no way of
specifying the work register count for blend shaders; it must be
strictly less than the work register count of the corresponding fragment
shader (which is fine since we force the fragment shader to report a
count of 16 with a blend shader as a major hack until we get register
pressure down for blend shaders).

TODO: pandecode the flags.

Signed-off-by: Alyssa Rosenzweig <[email protected]>

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