4 basic things here:
- Set SwiftShader formats to match the equivalent Vulkan format,
  when available
- Removed SwiftShader formats with no exact match in Vulkan formats
- Added all currently unavailable Vulkan formats in comments in the
  list, possibly to be added later, when necessary
- Marked all mandatory sampled formats in the list (in comments)

Bug b/118429780

Change-Id: I7d7b661e64cb4aee9eb724c64664cee8271cc48c
Reviewed-on: https://swiftshader-review.googlesource.com/c/21808Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>