Change Rvalid to Valid

Change all references to keywords like "Rvalid Values" to "Valid Values".
"Rvalid Values" has been deprecated.

Change-Id: I1b418fa69e5753c8bfb9e6a06a8b566359e10cae
Signed-off-by: Michael Walsh <micwalsh@us.ibm.com>
diff --git a/templates/pgm_template.py b/templates/pgm_template.py
index 22c9963..c597992 100755
--- a/templates/pgm_template.py
+++ b/templates/pgm_template.py
@@ -35,7 +35,7 @@
     """
 
     # Programmer must add these.
-    grv.rvalid_value("OPENBMC_HOST")
+    grv.valid_value("OPENBMC_HOST")
 
     return