Enable Witherspoon MRW hwmon generation

Generate Witherspoon's hwmon conf files from
the mrw.

Change-Id: I120f4f91de48b36ba4b610eab35df98e3e84b534
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
diff --git a/meta-witherspoon/recipes-phosphor/sensors/phosphor-hwmon%.bbappend b/meta-witherspoon/recipes-phosphor/sensors/phosphor-hwmon%.bbappend
new file mode 100644
index 0000000..9b01712
--- /dev/null
+++ b/meta-witherspoon/recipes-phosphor/sensors/phosphor-hwmon%.bbappend
@@ -0,0 +1 @@
+inherit phosphor-hwmon-mrw