lavapipe: support host image copying on compressed texture formats

lavapipe: support host image copying on compressed texture formats

dEQP-VK.image.host_image_copy.query.linear.bc5_snorm_block,Fail
dEQP-VK.image.host_image_copy.query.linear.bc7_unorm_block,Fail
dEQP-VK.image.host_image_copy.query.optimal.bc5_snorm_block,Fail
dEQP-VK.image.host_image_copy.query.optimal.bc7_unorm_block,Fail

Fixes: 9e9d90c6c381 ("lavapipe: VK_EXT_host_image_copy")
Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25609>