opal/hmi: Don't re-read HMER multiple times
opal/hmi: Don't re-read HMER multiple times

We want to make sure all reporting and actions are based
upon the same snapshot of HMER in case bits get added
by HW while we are in OPAL.

Signed-off-by: Benjamin Herrenschmidt <a7089bb6e7e92505d88aaff006cbdd60cc9120b6@kernel.crashing.org>
Signed-off-by: Stewart Smith <ec31ab75ddf977353c8f660f92ea8b23f64aef25@linux.ibm.com>

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