CUPD: Improve elog in code update path
CUPD: Improve elog in code update path

Log exact failure reason in code update path. Also removed
possible duplicate error logging.

Signed-off-by: Vasant Hegde <a6d753843573f7bfed5075c1e875b0be8007a0ab@linux.vnet.ibm.com>
Reviewed-by: Deepthi Dharwar <3f83f38ad2e2ddcc47e21eb12a05ce66eb4cf525@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <a7089bb6e7e92505d88aaff006cbdd60cc9120b6@kernel.crashing.org>

mikey/skiboot,shenki/skiboot,csmart/skiboot,qemu/skiboot,qemu/skiboot,csmart/skiboot,apopple/skiboot,legoater/skiboot,shenki/skiboot,jk-ozlabs/skiboot,qemu/skiboot,legoater/skiboot,cyrilbur-ibm/skiboot,apopple/skiboot,open-power/skiboot,csmart/skiboot,mikey/skiboot,qemu/skiboot,legoater/skiboot,cyrilbur-ibm/skiboot,ddstreet/skiboot,shenki/skiboot,neelegup/skiboot,ddstreet/skiboot,shenki/skiboot,ddstreet/skiboot,qemu/skiboot,apopple/skiboot,open-power/skiboot,mikey/skiboot,legoater/skiboot,stewart-ibm/skiboot,open-power/skiboot,neelegup/skiboot,shenki/skiboot,legoater/skiboot,open-power/skiboot,stewart-ibm/skiboot,cyrilbur-ibm/skiboot,jk-ozlabs/skiboot,open-power/skiboot,stewart-ibm/skiboot,neelegup/skiboot,jk-ozlabs/skiboot