Staging: Greybus: Fix trailing */ in block comments

This patch fixes the following checkpath.pl warning
WARNING: Block comments use a trailing */ on a separate line

Signed-off-by: Rahul Krishnan <mrahul.krishnan@gmail.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>