ARM: dts: aspeed: rainier: Remove duplicate i2c busses

This is a revert of "ARM: dts: aspeed: rainier: Add i2c devices", which
was already applied to the tree.

Fixes: 9c44db70 ("ARM: dts: aspeed: rainier: Add i2c devices")
Reviewed-by: Jim Wright <wrightj@linux.vnet.ibm.com>
Tested-by: Jim Wright <wrightj@linux.vnet.ibm.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>