Remove DHE ciphers from defaults list

Since DHE does not allow negotiation of the group used, it is pretty
broken. ECDHE at least allows the negotiation of the group which allows
its security to be maintained with configuration changes in the client
or server.

This tracks a change in Conscrypt merged in
906cfad7e08fd339be06441ff42960743f95053c

Test: cts-tradefed run cts -m CtsLibcoreOkHttpTestCases -a arm64-v8a
Test: cts-tradefed run cts -m CtsLibcoreTestCases -a arm64-v8a
Test: make docs
Test: visual inspection of docs output in web browser
Change-Id: Ic90297bf6b1c82af192a887797238ad250e3d1ce
3 files changed