wspoon: Update fan/thermal shutdown target

A chassis hard poweroff should be used when too many cores are overtemp
and when not enough fans are found functional or present.

Change-Id: Ic472e2e7c2e0a49c0bf1869924491e743e3ed24d
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
diff --git a/meta-witherspoon/recipes-phosphor/fans/witherspoon-thermal-policy/thermal-policy.yaml b/meta-witherspoon/recipes-phosphor/fans/witherspoon-thermal-policy/thermal-policy.yaml
index f4419e0..81f93d1 100644
--- a/meta-witherspoon/recipes-phosphor/fans/witherspoon-thermal-policy/thermal-policy.yaml
+++ b/meta-witherspoon/recipes-phosphor/fans/witherspoon-thermal-policy/thermal-policy.yaml
@@ -162,7 +162,7 @@
   interface: org.freedesktop.systemd1.Manager
   method: StartUnit
   args:
-    - value: obmc-host-shutdown@0.target
+    - value: obmc-chassis-hard-poweroff@0.target
       type: string
     - value: replace
       type: string