The reboot command fails due to the IRQ vector region not being reset to ROM before handing control back to the BIOS.

Backport the reboot command fix from the Zephyr firmware here:

https://gitlab.raptorengineering.com/kestrel-collaboration/kestrel-firmware/zephyr-rtos/-/commit/0fafab9aa1109c21a074667098b5018a6c4b5315