Raspberry Pi zero 2 w updates

[Dave Tyson <dtyson%anduin.org.uk@localhost>]

Can someone take a look at PR kern/57498 which includes patches and
links to resources to provide a native dtb for the rpi02w and also
update the rpi firmware so it will boot up without having to manually
pull down new versions of the boot code

Note although the wifi chip is now visible the rpi02w uses the
synatics syn43436 and this needs different firmware. This is available
on some linux distros and does get the wifi working, but it's a bit
flaky and will need some work on the bwfm driver.

Thank you,
Dave