Align the header of variable from 1 to 4, which can avoid the size of variable content corrupt if the critical data cross two flash block.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@4543 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Include/VariableFormat.h

@@ -38,11 +38,13 @@
 // 8 is for IPF archtecture.
 //
 #if defined (MDE_CPU_IPF)
-#define ALIGNMENT  8
+#define ALIGNMENT         8
 #else
-#define ALIGNMENT  1
+#define ALIGNMENT         1
 #endif
 
+#define HEADER_ALIGNMENT  4
+
 //
 // Variable Store Status
 //