[BOOT] Add stubs to complete MmPaInitialize()

MmPaInitialize() is now complete
Added BlpMmInitializeConstraints() and MmMdRemoveRegionFromMdlEx()

BOOT/ENVIRON/INC/bootlib.h

@@ -63,6 +63,11 @@ BlpFwInitialize (
     IN PBOOT_FIRMWARE_DATA FirmwareData
     );
 
+NTSTATUS
+BlpMmInitializeConstraints (
+    VOID
+    );
+
 NTSTATUS
 BlpMmInitialize (
     IN PBOOT_MEMORY_INFO MemoryInfo,

BOOT/ENVIRON/INC/mm.h

@@ -18,7 +18,8 @@ Abstract:
 
 #include "bootlib.h"
 
-#define MDL_OPERATION_FLAGS_TRUNCATE 0x02
+#define MDL_OPERATION_FLAGS_TRUNCATE 0x00000002
+#define MDL_OPERATION_FLAGS_PHYSICAL 0x40000000
 
 NTSTATUS
 MmFwGetMemoryMap (
@@ -52,6 +53,15 @@ MmMdRemoveDescriptorFromList (
     IN PMEMORY_DESCRIPTOR Descriptor
     );
 
+NTSTATUS
+MmMdRemoveRegionFromMdlEx (
+    IN PMEMORY_DESCRIPTOR_LIST Mdl,
+    IN ULONGLONG FirstPage,
+    IN ULONGLONG PageCount,
+    IN ULONG Flags,
+    OUT PMEMORY_DESCRIPTOR_LIST Unused
+    );
+
 NTSTATUS
 MmMdFreeDescriptor (
     IN PMEMORY_DESCRIPTOR Descriptor