ARM: dts: aspeed: rainier: Don't shout addresses

Make them lowercase.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/20201002063414.275161-4-andrew@aj.id.au


Signed-off-by: Joel Stanley <joel@jms.id.au>