ARM: dts: aspeed: rainier: Add second cfam on the hub

The hub FSI master can access the cfams on two other processors. Reflect
this by adding a second cfam to the first hub description.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
Tested-by: Andrew Geissler <geissonator@yahoo.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>