ipq806x: 5.15: fix wrong boot-partitions values for split partitions

ipq806x: 5.15: fix wrong boot-partitions values for split partitions

The refreshed patch actually use the format of <start size start size>
instead of <start end start end>. This cause boot fail since the rootfs
can't be mounted with these wrong values.

Fix it to the correct format in each affected dts.

Fixes: #11498
Fixes: 6134ba4a34db ("ipq806x: 5.15: add boot-partitions binding to fix block warning")
Tested-by: Matt Buczko <mbuczko@hotmail.com> # Askey RT4230W
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>