Turris 1.x zImage is not updated while updating to newer version

Issue: zImage is not updated in /dev/mmcblk0p1, but it is updated in /dev/mmcblk0p2
This results to hiccup when the kernel is updated, but you are running older version of kernel.

root@turris:~# uname -a
Linux turris 4.14.294 #0 SMP Tue Sep 27 03:45:29 2022 ppc GNU/Linux
root@turris:~# opkg list-installed | grep kernel
kernel - 5.10.147-1-42186e8efb70da7a8430b969416854a2

Maybe solution:

1. Run usr/sbin/turris1x-btrfs-kernel-install in postinst script of turris1x-btrfs

Workaround: run pkgupdate, reboot and that's it.