anv: retain the is_array state in create_plane_tex_instr_implicit

This does not seem to fix anything ATM but is the right thing todo.

Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Fixes: f3e91e78a3 ("anv: add nir lowering pass for ycbcr textures")
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>

src/intel/vulkan/anv_nir_lower_ycbcr_textures.c

@@ -269,6 +269,7 @@ create_plane_tex_instr_implicit(struct ycbcr_state *state,
    tex->texture_index = old_tex->texture_index;
    tex->texture_array_size = old_tex->texture_array_size;
    tex->sampler_index = old_tex->sampler_index;
+   tex->is_array = old_tex->is_array;
 
    nir_ssa_dest_init(&tex->instr, &tex->dest,
                      old_tex->dest.ssa.num_components,