ARM: dts: aspeed: wedge40: Use common dtsi

Simplify the Wedge40 device tree by using the common dtsi.

Signed-off-by: Tao Ren <rentao.bupt@gmail.com>
Reviewed-by: Patrick Williams <patrick@stwcx.xyz>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/20201111232330.30843-3-rentao.bupt@gmail.com


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