libstb/cvc: Register P8 secure ROM code correctly
libstb/cvc: Register P8 secure ROM code correctly

Register the location of the secure ROM, not the address of the location.

Fixes: 594c7a6ae3ccc
Signed-off-by: Stewart Smith <ec31ab75ddf977353c8f660f92ea8b23f64aef25@linux.vnet.ibm.com>

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