Fix alignment issues in SBE-HB structure

Add padding to keep all fields aligned to 8-bytes
Add explicit attribute to ensure structure is packed

Change-Id: I55ca10034d7adf3e766edb4d0071f649c7c90446
CQ: SW391259
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/41584
Reviewed-by: Martin Gloff <mgloff@us.ibm.com>
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: Thi N. Tran <thi@us.ibm.com>
Reviewed-by: Sachin Gupta <sgupta2m@in.ibm.com>
Reviewed-by: Jennifer A. Stofer <stofer@us.ibm.com>
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/41614
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>

src/import/chips/p9/procedures/hwp/nest/p9_sbe_hb_structures.H

@@ -74,6 +74,8 @@ union BootloaderSecureSettings
 };
 
 // Structure starts at the bootloader zero address
+//   Note - this structure must remain 64-bit aligned to
+//          maintain compatibility with Hostboot
 struct BootloaderConfigData_t
 {
     uint32_t version;         // bytes  4:7  Version field so we know if there is new data being added
@@ -82,8 +84,10 @@ struct BootloaderConfigData_t
     uint16_t pnorSizeMB;      // bytes 10:11 Size of PNOR in MB  [ATTR_PNOR_SIZE]
     uint64_t blLoadSize;      // bytes 12:19 Size of Load (Exception vectors and Bootloader)
     BootloaderSecureSettings  secureSettings  ; // byte  20
-    uint64_t xscomBAR;        // bytes 21:28 XSCOM MMIO BAR
-    uint64_t lpcBAR;          // bytes 29:36 LPC MMIO BAR
-};
+    uint8_t reserved[7];      // bytes 21:27 Reserved space to maintain 64-bit alignment
+    uint64_t xscomBAR;        // bytes 28:35 XSCOM MMIO BAR
+    uint64_t lpcBAR;          // bytes 36:43 LPC MMIO BAR
+}; // Note: Want to use '__attribute__((packed))' but compiler won't let us
+
 
 #endif