Assert static key ECDH disallowed in default cipher suites. This is a follow-up to 5b15ad6b3d508a97d1cd23667afaee8c55072718 which removed static key ECDH cipher suites from the default list, but where the list of permitted key exchanges wasn't updated. Bug: 11220570 Change-Id: I319e21bf4475ddb9e6262b41dda99f5e33b1816f