reboot broken on RPi4 on main

From: Mike Karels <mike_at_karels.net>
Date: Thu, 23 Feb 2023 22:01:36 UTC
Reboot (shutdown -r) is hanging on RPi4 on main as of today’s snapshot.
It hangs after printing the Uptime.  The initial bootstrap and boot from
power-up work.  I haven’t tested a snapshot since Jan 1, so I’m not sure
when it stopped working.  Any ideas what might have broken it?  I can bisect
the recent snapshots if nothing else.

13.2-BETA2 works, however.

		Mike