Remove blacklist of dual source blending on AMD vulkan

Bug: skia:6405
Change-Id: I3a7145fb7f337c11e0674c6c2b364040925005bb
Reviewed-on: https://skia-review.googlesource.com/111400
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
1 file changed