greybus: connection: name routines consistently

Routines should be named this way: gb_<object>_<operation>. Fix all
routines that don't match this.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>