Stop ATTN service before instruction stop

Ensuring that ATTN service is stopped after PHYP has completed the power
off process. PHYP must be done before starting instruction stop. So that
is a good target to use.

Tested: Verify that during soft-off attention handler will service
attentions (inject error during graceful shutdown).

Signed-off-by: Zane Shelley <zshelle@us.ibm.com>
Change-Id: I9611546d3133c444fe62500fc76750558945baf7
diff --git a/attn/attn_handler.service.in b/attn/attn_handler.service.in
index ff31f34..e081b19 100644
--- a/attn/attn_handler.service.in
+++ b/attn/attn_handler.service.in
@@ -7,7 +7,6 @@
 After=op-cfam-reset.service
 After=cfam_override@0.service
 After=openpower-update-bios-attr-table.service
-Conflicts=obmc-host-stop@0.target
 Conflicts=obmc-host-timeout@0.target
 
 [Service]