kernel: bump 4.19 to 4.19.93

Refreshed all patches.

The patch hack-4.19/550-loop-better-discard-for-block-devices.patch was
replaced with an new version of the patch from:
https://lore.kernel.org/patchwork/patch/1153625/
https://lore.kernel.org/patchwork/patch/1153626/

Compile-tested on: ipq40xx, lantiq
Runtime-tested on: ipq40xx, lantiq

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

target/linux/generic/hack-4.19/902-debloat_proc.patch

@@ -393,7 +393,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  }
 --- a/net/ipv4/route.c
 +++ b/net/ipv4/route.c
-@@ -410,6 +410,9 @@ static struct pernet_operations ip_rt_pr
+@@ -411,6 +411,9 @@ static struct pernet_operations ip_rt_pr
  
  static int __init ip_rt_proc_init(void)
  {