staging: lustre: cfs_time_current() -> jiffies.

Discard cfs_time_current() and cfs_time_current64()
and use jiffies and get_jiffies_64() like the rest of the kernel.

Signed-off-by: NeilBrown <neilb@suse.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>