remove bit, srgbnl config in DM

We're not going to need the bit.

I've rewritten "esrgb" and "srgbnl" to express themselves the way I'd
like them to work.  Their images are supressed in Gold already.

Change-Id: I6da58cc75dcb998cbfcf9a8f65de31c030adb494
Reviewed-on: https://skia-review.googlesource.com/130506
Reviewed-by: Brian Osman <brianosman@google.com>
7 files changed