staging: lustre: libcfs: discard cfs_time_shift().

This function simply multiplies by HZ and adds jiffies.
This is simple enough to be opencoded, and doing so
makes the code easier to read.

Same for cfs_time_shift_64()

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