switch Skia to explicit big-endian 16-bit skcms type

Change-Id: I1f3fd1d267631b2360da0054ba76b3aaffcec01b
Reviewed-on: https://skia-review.googlesource.com/154122
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
2 files changed