fsp-elog: Reduce verbosity of elog messages
fsp-elog: Reduce verbosity of elog messages

These messages just fill up the opal console log with useless messages
resulting in us losing useful information.

They have been like this since the first commit in skiboot. Make them
trace.

Signed-off-by: Michael Neuling <7b0ab45a730e48a69239010b5b8fe5fa4e8eaac6@neuling.org>
Reviewed-by: Vasant Hegde <a6d753843573f7bfed5075c1e875b0be8007a0ab@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <ec31ab75ddf977353c8f660f92ea8b23f64aef25@linux.vnet.ibm.com>

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