MdeModulePkg: Provide EfiBootManagerRegisterBootDescriptionHandler

This API can be used for platform to customize the boot description other than using core provided boot description.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17547 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Library/UefiBootManagerLib/InternalBm.h

@@ -123,6 +123,13 @@ ForEachVariable (
   VOID                        *Context
   );
 
+#define BM_BOOT_DESCRIPTION_ENTRY_SIGNATURE SIGNATURE_32 ('b', 'm', 'd', 'h')
+typedef struct {
+  UINT32                                    Signature;
+  LIST_ENTRY                                Link;
+  EFI_BOOT_MANAGER_BOOT_DESCRIPTION_HANDLER Handler;
+} BM_BOOT_DESCRIPTION_ENTRY;
+
 /**
   Repair all the controllers according to the Driver Health status queried.
 **/