arm: dts: ls1028a-rdb: sort nodes alphabetically

The nodes in the NXP LS1028A-RDB device tree are out of order, regroup
them alphabetically to have a simple delta when the Linux device tree is
brought in.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>