This enables the devices used in the AST2400 family of BMC SoCs:

 - VUART
 - SPI NOR
 - LPC controller
 - LPC snoop (port 80)
 - Ethernet
 - GPIO
 - ADC
 - I2C
 - Random number generator
 - IPMI KCS
 - IPMI BT
 - Fan/Tach
Acked-by: Andrew Jeffery <andrew@aj.id.au>
Signed-off-by: Joel Stanley <joel@jms.id.au>