Remove deprecated morphology image filter headers

Bug: skia:11230
Change-Id: I7e065bfe1ba567396e242b45076b520f1aa3e414
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/371963
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
6 files changed