Make explorer endian attributes platInit

Change-Id: I2c8f3ca7d73db586d39ec7fd1490e70baf9a18da
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/85284
Reviewed-by: Louis Stermole <stermole@us.ibm.com>
Reviewed-by: Steven B Janssen <janssens@us.ibm.com>
Dev-Ready: Steven B Janssen <janssens@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Reviewed-by: STEPHEN GLANCY <sglancy@us.ibm.com>
Tested-by: Hostboot CI <hostboot-ci+hostboot@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/gerrit1/85303
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP HW <op-hw-jenkins+hostboot@us.ibm.com>
Reviewed-by: Daniel M Crowell <dcrowell@us.ibm.com>

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

@@ -290,7 +290,7 @@
             SWAP = 0,
             NO_SWAP = 1
         </enum>
-        <writeable/>
+        <platInit/>
     </attribute>
 
     <attribute>
@@ -307,7 +307,7 @@
             BIG_ENDIAN = 0,
             LITTLE_ENDIAN = 1
         </enum>
-        <writeable/>
+        <platInit/>
     </attribute>
 
     <attribute>