aco: use VOP2 for v_cvt_pkrtz_f16_f32 if possible
This patch also does a slight rework of export_fs_mrt_color() to avoid setting of enabled channels which are not used. Totals from 52404 (38.38% of 136546) affected shaders (NAVI): SGPRs: 3097443 -> 3097435 (-0.00%) CodeSize: 189151600 -> 188546200 (-0.32%) Instrs: 36445061 -> 36445104 (+0.00%); split: -0.00%, +0.00% Cycles: 1739388020 -> 1739388192 (+0.00%); split: -0.00%, +0.00% VMEM: 21071501 -> 21071665 (+0.00%); split: +0.00%, -0.00% SMEM: 3470983 -> 3470982 (-0.00%); split: +0.00%, -0.00% PreSGPRs: 2058965 -> 2058962 (-0.00%) PreVGPRs: 1860294 -> 1860295 (+0.00%) Reviewed-by:Rhys Perry <pendingchaos02@gmail.com> Part-of: <mesa/mesa!6777>
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