Fix TransferBufferTest for TegraX1

Bug: skia:
Change-Id: Ia64f48581e8003baec2eeaa4821354350b3333f4
Reviewed-on: https://skia-review.googlesource.com/20504
Reviewed-by: Robert Phillips <robertphillips@google.com>
Reviewed-by: Eric Boren <borenet@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
3 files changed