wspoon: Inhibit phosphor-fan-presence-mrw

Use a hardcoded config file for the Witherspoon
fan presence configuration.

Hopefully a somewhat temporary workaround of missing tags in the
Witherspoon MRW.

Change-Id: If702959012a3ac627e5fb3e3307f2ee79a9af3d0
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-openbmc-machines/meta-openpower/meta-ibm/meta-witherspoon/conf/machine/witherspoon.conf b/meta-openbmc-machines/meta-openpower/meta-ibm/meta-witherspoon/conf/machine/witherspoon.conf
index 69381da..e8eef10 100644
--- a/meta-openbmc-machines/meta-openpower/meta-ibm/meta-witherspoon/conf/machine/witherspoon.conf
+++ b/meta-openbmc-machines/meta-openpower/meta-ibm/meta-witherspoon/conf/machine/witherspoon.conf
@@ -17,3 +17,7 @@
 
 # Inhibit phosphor-hwmon-config-mrw
 VIRTUAL-RUNTIME_phosphor-hwmon-config = ""
+
+# Inhibit phosphor-fan-presence-mrw-native
+PREFERRED_PROVIDER_virtual/phosphor-fan-presence-config = \
+    "phosphor-fan-presence-config-native"