freedreno/a6xx: fix resource_copy_region()

pctx->resource_copy_region() needs to fall back to sw copy for
non-renderable formats.  But previously for things that we could
not use the blitter for, would fall back to 3d.  Which won't work
if 3d can't render to the dst format either.

Instead rework things to fallback to fd_resource_copy_region(),
which will try 3d core and then fall back to memcpy().

Fixes (for example) dEQP-GLES3.functional.texture.format.sized.2d.rgb9_e5_pot

Signed-off-by: Rob Clark <[email protected]>

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