gbsim: loopback: Start using send_response()
gbsim: loopback: Start using send_response()

Lets start using send_response() for loopback protocol drivers. This
gets rid of lots of redundant code.

Signed-off-by: Viresh Kumar <5ff32272b3d9f86512eddc8e0af523fc6f7924e5@linaro.org>
Tested-by: Bryan O'Donoghue <165dc05575478af93ac2f97f67be6e1756010094@linaro.org>
Signed-off-by: Greg Kroah-Hartman <4645f7897fd33786a2ee1264d590b3c400559d85@google.com>

gregkh/gbsim,bcousson/gbsim,projectara/gbsim,bcousson/gbsim,gregkh/gbsim,bcousson/gbsim,projectara/gbsim