[bazel] Use RBE when building task drivers

Local measurements show that using RBE (with a warm cache)
vs local can result in a 2x faster build.

No-Try: true
Change-Id: Ib900a90564f105de848c9aeb0b745e5fec77da53
Bug: skia:12541
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/525637
Reviewed-by: Joe Gregorio <jcgregorio@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
4 files changed