radv/meta: Set num_components on image_store intrinsics

radv/meta: Set num_components on image_store intrinsics

Now that image load/store intrinsics are variable-width, we need to set
num_components accordingly.  In 15d39f474b890, both glsl_to_nir and
spirv_to_nir were updated to properly set num_components but radv meta
was left behind.

Fixes: 15d39f474b890 "nir: Make image load/store intrinsics..."
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Tested-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>