ARM: dts: aspeed: everest: Reorganise FSI description

Use the P10 quad FSI CFAM description to reduce duplication and add the
I2C responders and associated engines.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
Link: https://lore.kernel.org/r/20230809074921.116987-5-joel@jms.id.au


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