freedreno/ir3: don't offset inloc by 8

freedreno/ir3: don't offset inloc by 8

On a3xx/a4xx, the SP_VS_VPC_DST_REG.OUTLOCn is offset by 8, so we used
to add this offset into fs->inputs[n].inloc.  But a5xx drops this extra
offset-by-8.  So instead make inloc zero based and add the offset when
we emit OUTLOCn values (for the gen's that need the offset).

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