Move GrTypesPriv.h to include/private

Bug: skia:
Change-Id: I68610fed67a70454a815229c47b78ea6d9463a43
Reviewed-on: https://skia-review.googlesource.com/24624
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
4 files changed