Switch SkMorphologyImageFilter over to new onFilterImage interface

This now relies on: https://codereview.chromium.org/1826233002/ (Add rowBytesAsPixels and shiftPerPixel to SkPixmap)

TBR=bsalomon@google.com

GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1819393002

Review URL: https://codereview.chromium.org/1819393002
3 files changed