Add generic attribute accessor script and makefiles

  Added makefiles for generic and ocmb/explorer attrs
  Also add mssAccessorName tag to explorer attrs

Change-Id: I738c44e9bdf1999eb2746e79d4849683204ae567
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/69017
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Reviewed-by: Louis Stermole <stermole@us.ibm.com>
Tested-by: Hostboot CI <hostboot-ci+hostboot@us.ibm.com>
Reviewed-by: STEPHEN GLANCY <sglancy@us.ibm.com>
Reviewed-by: Christian R. Geddes <crgeddes@us.ibm.com>
Reviewed-by: Jennifer A. Stofer <stofer@us.ibm.com>
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/69571
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>

src/import/chips/ocmb/explorer/procedures/xml/attribute_info/exp_attributes.xml

@@ -52,6 +52,7 @@
             ENTERPRISE = 1
         </enum>
         <writeable/>
+        <mssAccessorName>ocmb_enterprise_mode</mssAccessorName>
     </attribute>
 
     <attribute>
@@ -68,6 +69,7 @@
             OVERRIDE_NON_ENTERPRISE = 1
         </enum>
         <writeable/>
+        <mssAccessorName>ocmb_nonenterprise_mode_override</mssAccessorName>
     </attribute>
 
     <attribute>
@@ -84,6 +86,7 @@
             HALF_DIMM = 1
         </enum>
         <writeable/>
+        <mssAccessorName>ocmb_half_dimm_mode</mssAccessorName>
     </attribute>
 
     <attribute>
@@ -100,6 +103,7 @@
             OVERRIDE_HALF_DIMM = 2
         </enum>
         <writeable/>
+        <mssAccessorName>ocmb_half_dimm_mode_override</mssAccessorName>
     </attribute>
 
 </attributes>