kernel: bump 4.9 to 4.9.159

kernel: bump 4.9 to 4.9.159

Refreshed all patches.

Remove upstreamed:
- 023-1-smsc95xx-Use-skb_cow_head-to-deal-with-cloned-skbs.patch
- 023-6-ch9200-use-skb_cow_head-to-deal-with-cloned-skbs.patch
- 023-7-kaweth-use-skb_cow_head-to-deal-with-cloned-skbs.patch
- 050-usb-dwc2-Remove-unnecessary-kfree.patch
- 092-netfilter-nf_tables-fix-mismatch-in-big-endian-syste.patch
- 272-uapi-if_ether.h-prevent-redefinition-of-struct-ethhd.patch

Fixes:
- CVE-2018-1000026

Compile-tested on: ar71xx
Runtime-tested on: ar71xx

Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com>