LU-10805 libcfs: timer_setup() API changes

LU-10805 libcfs: timer_setup() API changes

Linux kernel 4.15 replaced setup_timer() with the new
interface timer_setup().
Introduce cfs wrappers to handle the API changes.

Linux-commit: e99e88a9d2b067465adaa9c111ada99a041bef9a

Signed-off-by: Li Dongyang <dongyangli@ddn.com>
Change-Id: Ib79495f9ab7e955d6f72f1e9390cec0e23e2d641
Reviewed-on: https://review.whamcloud.com/31790
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@gmail.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>