SkSplicer stage parity

I noticed scale_u8 is implemented in SkSplicer_stages but not _lowp.
That's not for any good reason... scale_u8 makes fine sense in _lowp.

All other stages missing in _lowp are nuts to attempt without floats.

This also renames the to_fixed15 lambdas to from_u8 functions.
Everything in the file converts to or from fixed15; the interesting
question is the other format.  Similarly, from_fixed15 becomes to_u8.

Change-Id: I10616b6772c65bd1acb9857f4f5b5f70a4f01bf4
Reviewed-on: https://skia-review.googlesource.com/7323
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>

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