Rename MM_LA57_SHIFT to MM_P5I_SHIFT for consistency

sdk/xtdk/amd64/mmtypes.h

@@ -30,7 +30,7 @@
 #define MM_PDI_SHIFT                               21
 #define MM_PPI_SHIFT                               30
 #define MM_PXI_SHIFT                               39
-#define MM_LA57_SHIFT                              48
+#define MM_P5I_SHIFT                               48
 
 /* Number of PTEs per page */
 #define MM_PTE_PER_PAGE                            512