Upstream DTS commit 62a5017bf825c9e4d317 ("ARM: dts: vexpress: specify
AFS partition") [1] introduced an empty node at /smb@4000000
/motherboard/flash@0,00000000/partitions, which is preferred by the OF
partitions parser over the single partition nodes. In the same commit,
upstream set the compatible to "arm,arm-firmware-suite", which barebox
does not know about. Adapt our fixed partition setup accordingly by
wrapping all partitions in an extra "partitions" node with the correct
compatible.

[1]: https://git.kernel.org/linus/62a5017bf825c9e4d3176eb975a01c329a9f36

Fixes: 6940ba22c66ac1c71350 ("dts: update to v5.3-rc1")
Signed-off-by: Roland Hieber <rhi@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>