panvk/shader: [de]serialize desc_info.max_varying_loads

Fixes: de86641d3f ("panvk: Limit AD allocation to max var loads in v9+")
Acked-by: Eric R. Smith <eric.smith@collabora.com>
Reviewed-by: Lars-Ivar Hesselberg Simonsen <lars-ivar.simonsen@arm.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38019>

src/panfrost/vulkan/panvk_vX_shader.c

@@ -1582,6 +1582,7 @@ shader_desc_info_deserialize(struct panvk_device *dev,
    blob_copy_bytes(blob, shader->desc_info.dyn_bufs.map,
                    sizeof(*shader->desc_info.dyn_bufs.map) *
                       shader->desc_info.dyn_bufs.count);
+   shader->desc_info.max_varying_loads = blob_read_uint32(blob);
 #endif
 
    return VK_SUCCESS;
@@ -1731,6 +1732,7 @@ shader_desc_info_serialize(struct blob *blob,
    blob_write_bytes(blob, shader->desc_info.dyn_bufs.map,
                     sizeof(*shader->desc_info.dyn_bufs.map) *
                        shader->desc_info.dyn_bufs.count);
+   blob_write_uint32(blob, shader->desc_info.max_varying_loads);
 #endif
 }