mpc85xx: p1010: Fix Sophos RED 15w NAND partitions

mpc85xx: p1010: Fix Sophos RED 15w NAND partitions

This partially reverts 78d259e7d28d212425164fc64bf0b9d8669d6020.
That commit broke mounting the root fs on Sophos RED 15w due to
partition size mismatch, and changed the partition sequence, causing
the OpenWrt partition numbers to change from mtd3:kernel/mtd4:ubi to
mtd4:kernel/mtd5:ubi.

Fixes: 78d259e7d28d ("mpc85xx: fix some dtc warnings")
(cherry-picked from commit 09e7b24ceb5d9310334c4f88327dc6d58052e7fd)
Signed-off-by: Shine <4c.fce2@proton.me>
Link: https://github.com/openwrt/openwrt/pull/21062
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>