This implements the SVC "ping" command. It's tiny and simple, but we
need something like this in order for us to "know" if all is working
well.
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>