`pvr_get_hw_clear_color()` now packs formats based on the accum
format which is how the hw deals with the formats internally and
might not line up exactly with the vk format representation.
E.g. R5G6B5_UNORM_PACK16 uses the U8 accum format so the USC will
internally use 3 bytes (1 per component) to deal with it instead
of 2 bytes which the vk format specifies. On USC EMITPIX, the PBE
will pack the results to 2 bytes using PACKMODE_R5G6B5 resulting
in the final value being in the vk format representation.
Signed-off-by: Karmjit Mahil <Karmjit.Mahil@imgtec.com>
Reviewed-by: Frank Binns <frank.binns@imgtec.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19218>
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