ARM: dts: aspeed: Add LPC and child devices

Ensure the ordering is correct and add all of the children in the SoC
device trees for the ast2400 and ast2500.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Joel Stanley <joel@jms.id.au>