greybus: connection: compare hd_cport_id for matching SVC protocol

SVC protocol isn't per interface, but per entire entire endo. And so svc
cport id must be matched against hd_cport_id, not per-interface cport
id.

Fixes: 82edfac17e5f ("connection: don't send connected/disconnected events for SVC connection")
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>