Multiple sampler planes (one for luma, one for chroma) are needed to
support CONVERSION_SEPARATE_RECONSTRUCTION_FILTER_BIT.
Multiple texture descriptors (one per plane) are needed for the
downsampling in nir_vk_lower_ycbcr_tex() to work in panvk.
Signed-off-by: Rebecca Mckeever <rebecca.mckeever@collabora.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32563>