greybus: svc: Fix endian of hotplug request data

data of hotplug request should exchange to native
CPU format before assignment.

Signed-off-by: Phong Tran <tranmanphong@gmail.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>