arm64: dts: ls1028a-rdb: sort nodes alphabetically by label

In preparation for this board's device tree synchronization with U-Boot,
we must find a common node ordering pattern. Alphabetical sounds about
right.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>