staging: greybus: arche-platform: fix OF populate on driver rebind

staging: greybus: arche-platform: fix OF populate on driver rebind

Since commit c6e126de43e7 ("of: Keep track of populated platform
devices") child devices will not be created by of_platform_populate()
if the devices had previously been deregistered individually so that the
OF_POPULATED flag is still set in the corresponding OF nodes.

Switch to using of_platform_depopulate() instead of open coding so that
the child devices are created if the driver is rebound.

Fixes: bc142bbb4ceb ("greybus: arche_platform: Remove child's platform device as part of _remove() fn")
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://patch.msgid.link/20251219105928.23329-4-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>