Remove CQ-Verified submit requirement

This is proving problematic because it makes "submit to CQ" and "submit"
buttons hidden in the Gerrit UI until satisfied, which it may never be
if the CL intends to override the requirement.

Change-Id: I123e8ff781dd197f1d87b47d8bacd28cfed0c809
Reviewed-on: https://boringssl-review.googlesource.com/c/All-Projects/+/95428
Reviewed-by: David Benjamin <davidben@google.com>