staging: lustre: use setup_timer().

Use setup_timer() for initializing the timer, instead of structure
assignments.
This is the preferred/standard way.

Signed-off-by: Muhammad Falak R Wani <falakreyaz@gmail.com>
Acked-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>