imageSize() expects the last component of the return value to be the
number of layers in the texture array. In the case of cube map array,
it will return a ivec3, with the third component being the number of
layer-faces.
Fixes: dEQP-VK.image.image_size.cube_array.*
Signed-off-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8087>
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