Temporarily disable multitexturing for iOS

Bug: skia:7285
Change-Id: Ia55084334dab7b1887320348fa7d291f64332fdb
Reviewed-on: https://skia-review.googlesource.com/71780
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
1 file changed