core/platform: Replace printfs with prlog
core/platform: Replace printfs with prlog

Use prlog replacing printfs in core/platform.c

Signed-off-by: Vipin K Parashar <f7dae5427b3dec859a8db9747c62b0d6fc100992@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <ec31ab75ddf977353c8f660f92ea8b23f64aef25@linux.vnet.ibm.com>

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