hw/arm/aspeed: Add MAX31785 Fan controllers

Add MAX31785 fan controllers in machines so that the Linux driver
populates the sysfs interface.

Firework has two MAX31785 Fan controllers at 0x52, and 0x54 on bus 9.
Witherspoon has one at 0x52 on bus 3.
Rainier has one at 0x52 on bus 7.

Signed-off-by: Maheswara Kurapati <quic_mkurapat@quicinc.com>
Signed-off-by: Jae Hyun Yoo <quic_jaehyoo@quicinc.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20220627154703.148943-6-quic_jaehyoo@quicinc.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
diff --git a/hw/arm/Kconfig b/hw/arm/Kconfig
index 219262a..15fa79a 100644
--- a/hw/arm/Kconfig
+++ b/hw/arm/Kconfig
@@ -455,6 +455,8 @@
     select EMC141X
     select UNIMP
     select LED
+    select PMBUS
+    select MAX31785
 
 config MPS2
     bool