* Fix PARTITION property to allow default (0) partition to be overridden
Fix the partition selection to allow the bootloader PARTITION
property to override the reboot partition number if the reboot
argument is 0 or > 31. Previously, it was only allowing
partition numbers > 31 to be overridden.
See: https://github.com/raspberrypi/rpi-eeprom/issues/743
* Enable RPIBOOT in BOOT_ORDER / set-reboot-order
Previously, rpiboot required the bootrom to have initialised
rpiboot before running the firmware. Update the rpiboot
initialisation so that rpiboot to be enabled after booting from
SPI flash.
This could be selectively enabled by setting BOOT_ORDER property
(0x3) behind a GPIO conditional in the EEPROM config. On Pi5, the
set_reboot_order config.txt option or mailbox property can be
used to set a one-time boot-order on
N.B. There is no timeout for RPIBOOT so this should only be set
as the last boot mode OR used with a boot_watchdog.
