staging: lustre: discard cfs_time_seconds()

cfs_time_seconds() converts a number of seconds to the
matching number of jiffies.
The standard way to do this in Linux is  "* HZ".
So discard cfs_time_seconds() and use "* HZ" instead.

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