vk/image: Enable 2d single-sample color miptrees

vk/image: Enable 2d single-sample color miptrees

What's been tested, for both image views and color attachment views:

    - VK_FORMAT_R8G8B8A8_UNORM
    - VK_IMAGE_VIEW_TYPE_2D
    - mipLevels: 1, 2
    - baseMipLevel: 0, 1
    - arraySize: 1, 2
    - baseArraySlice: 0, 1

What's known to be broken:

    - Depth and stencil miptrees. To fix this, anv_depth_stencil_view
      needs major rework.
    - VkImageViewType != 2D
    - MSAA

Fixes Crucible tests:

  func.miptree.view-2d.levels02.array01.*
  func.miptree.view-2d.levels01.array02.*
  func.miptree.view-2d.levels02.array02.*