Disable standard derivatives on PowerVR Rogue

Bug: chromium:1197152
Change-Id: I542b141217bfcb7590c80bb8144714479535f984
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/415516
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: John Stiles <johnstiles@google.com>
1 file changed