radv: rely on pipeline layout when creating push descriptors with template

radv: rely on pipeline layout when creating push descriptors with template

descriptorSetLayout should be ignored for push descriptors. While
we are it, also ignore pipelineBindPoint.

Closes: https://gitlab.freedesktop.org/mesa/mesa/issues/2210
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3180>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3180>