ARM: dts: aspeed: Add Rainier 1S4U machine

The 1S4U version of the Rainier system has only 4 fans. Create a new
tree, include the 4U version, and delete the 2 extra fans.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
Link: https://lore.kernel.org/r/20210329150020.13632-23-eajames@linux.ibm.com


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