vk: Embed two surface states in anv_image_view

vk: Embed two surface states in anv_image_view

This prepares for merging VkAttachmentView into VkImageView.  The two
surface states are:

   anv_image_view::color_rt_surface_state:
       RENDER_SURFACE_STATE when using image as a color render target.

   anv_image_view::nonrt_surface_state;
       RENDER_SURFACE_STATE when using image as a non render target.

No Crucible regressions.