PerformancePkg/Dp_App: rebase to ARRAY_SIZE()

Cc: Daryl McDaniel <edk2-lists@mc2research.org>
Cc: Jaben Carsey <jaben.carsey@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

PerformancePkg/Dp_App/Dp.c

@@ -114,7 +114,7 @@ InitialShellParamList( void )
   //
   // Allocate one more for the end tag.
   //
-  ListLength = sizeof (ParamList) / sizeof (ParamList[0]) + 1;  
+  ListLength = ARRAY_SIZE (ParamList) + 1;  
   DpParamList = AllocatePool (sizeof (SHELL_PARAM_ITEM) * ListLength);
   ASSERT (DpParamList != NULL);