We actually need to enclose the whole section of partitions in a
`partitions { ... }` to assign it a `compatible = "fixed-partitions";
otherwise the partition referred to by `hwinfo` won't be registered
when bringing up MTD partitions, for example as per:
- <https://forum.openwrt.org/t/tp-link-c2600-missing-default-mac-mtd-partition-in-snapshot/103945/6>
- commit e2b03c16eb ("ipq806x: add missing enclosing partitions block for TP-Link C2600")'
Fixes: 8ec21d6bb2 ("mpc85xx: convert mtd-mac-address to nvmem implementation")
Signed-off-by: Martin Kennedy <hurricos@gmail.com>
[minor beautification]
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>