[Fontations] Move wrappers to sk_fontations namespace

Address review feedback from [1] to avoid likeliness of future naming
clashes/ODR violations due to generic naming.

[1] https://skia-review.googlesource.com/c/skia/+/748956/3/src/ports/SkTypeface_fontations.cpp#84

Bug: skia:40045335
Change-Id: I9bee7e3933443b0383b1223da4cf8b5118b80f8e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/749036
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Dominik Röttsches <drott@google.com>
Commit-Queue: Dominik Röttsches <drott@chromium.org>
2 files changed