PSTATE_PARAMETER_BLOCK structure alignment and error handling

- Add VDM EC attribute to generally disable VDMs on Nimbus DD1

Change-Id: I7743bbff9c8f975074068d760373b8b9b8294d32
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/42714
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: PPE CI <ppe-ci+hostboot@us.ibm.com>
Tested-by: Hostboot CI <hostboot-ci+hostboot@us.ibm.com>
Reviewed-by: Adam S. Hale <adam.samuel.hale@ibm.com>
Reviewed-by: Gregory S. Still <stillgs@us.ibm.com>
Reviewed-by: Jennifer A. Stofer <stofer@us.ibm.com>
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/42715
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: Dean Sanner <dsanner@us.ibm.com>
Tested-by: Dean Sanner <dsanner@us.ibm.com>

src/import/chips/p9/procedures/hwp/lib/p9_pstates_pgpe.h

@@ -283,7 +283,7 @@ typedef struct
 
     // @todo DPLL Droop Settings.  These need communication to SGPE for STOP
 
-} GlobalPstateParmBlock;
+} __attribute__((packed, aligned(1024))) GlobalPstateParmBlock;
 
 
 #ifdef __cplusplus