Disable advanced blend equations on Imagination driver 1.10 and earlier

Causes shader compilation to fail in Programs test on Tecno Spark 3 Pro.

Hopefully this doesn't affect performance as this GPU has framebuffer
fetch support.

Also reduce the effect depth limit in ProgramsTest.

Change-Id: I1fa5b8a670b3a074808cdba09c2ac97492067d33
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/261192
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
3 files changed