ARM: dts: aspeed: yosemite4: set bus13 frequency to 100k

Since the ocp debug card only supports 100k, the bus is also set to 100k.

Signed-off-by: Delphine CC Chiu <Delphine_CC_Chiu@wiwynn.com>
[AJ: Fixed fuzz due to prior IPMB patch]
Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>