hw/chiptod: Abort if core frequency is not set
hw/chiptod: Abort if core frequency is not set

Signed-off-by: Vasant Hegde <a6d753843573f7bfed5075c1e875b0be8007a0ab@linux.vnet.ibm.com>
Signed-off-by: Reza Arbab <4c896a97e6b998365c2d50a267b0f1ca5f7995de@linux.ibm.com>
Signed-off-by: Vasant Hegde <a6d753843573f7bfed5075c1e875b0be8007a0ab@linux.vnet.ibm.com>

shenki/skiboot,open-power/skiboot,open-power/skiboot,qemu/skiboot,legoater/skiboot,legoater/skiboot,open-power/skiboot,shenki/skiboot,legoater/skiboot,qemu/skiboot,shenki/skiboot,legoater/skiboot,shenki/skiboot,qemu/skiboot,open-power/skiboot,qemu/skiboot,legoater/skiboot,qemu/skiboot,open-power/skiboot,shenki/skiboot