ARM: dts: aspeed: tacoma: Fix fsi master node

This was broken when applying "ARM: dts: aspeed: tacoma: Add
host FSI description".

Fixes: a981c933 ("ARM: dts: aspeed: tacoma: Add host FSI description")
Acked-by: Andrew Jeffery <andrew@aj.id.au>
Signed-off-by: Joel Stanley <joel@jms.id.au>