kernel: bump 4.19 to 4.19.16

Refresh patches.
Remove upstreamed patches:
- backport/096-mips-math-emu-Write-protect-delay-slot-emulation-pages.patch
- backport/096-v4.20-netfilter-ipv6-Preserve-link-scope-traffic-original-.patch
- backport/424-v4.20-net-dsa-fix-88e6060-roaming.patch
- hack/100-mtd-rawnand-qcom-fix-memory-corruption-that-causes-p.patch
- pending/510-f2fs-fix-sanity_check_raw_super-on-big-endian-machines.patch
Update patch that no longer applies:
- backport/343-netfilter-nft_flow_offload-handle-netdevice-events-f.patch

Compile-tested: mesongx
Runtime-tested: mesongx

Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>

target/linux/generic/pending-4.19/655-increase_skb_pad.patch

@@ -9,7 +9,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
 
 --- a/include/linux/skbuff.h
 +++ b/include/linux/skbuff.h
-@@ -2480,7 +2480,7 @@ static inline int pskb_network_may_pull(
+@@ -2491,7 +2491,7 @@ static inline int pskb_network_may_pull(
   * NET_IP_ALIGN(2) + ethernet_header(14) + IP_header(20/40) + ports(8)
   */
  #ifndef NET_SKB_PAD