Rename "preferredInternalSampleCount" to "internalMultisampleCount"

Bug: skia:
Change-Id: If6e0287b3d631f4f3856875d94c84d1ddea44f22
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/223279
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
4 files changed