MdeModulePkg:Add new API HiiGetFormSetFromHiiHandle into UefiHiiLib

This function is mainly through the Hii handle to get the formset opcode.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Dandan Bi <dandan.bi@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18684 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Include/Library/HiiLib.h

@@ -224,6 +224,29 @@ HiiGetHiiHandles (
   )
 ;
 
+/**
+  This function allows a caller to extract the form set opcode form the Hii Handle.
+  The returned buffer is allocated using AllocatePool().The caller is responsible 
+  for freeing the allocated buffer using FreePool().
+
+  @param Handle            The HII handle.
+  @param Buffer            On return, opints to a pointer which point to the buffer that contain the formset opcode.
+  @param BufferSize        On return, points to the length of the buffer.
+
+  @retval EFI_OUT_OF_RESOURCES   No enough memory resource is allocated.
+  @retval EFI_NOT_FOUND          Can't find the package data for the input Handle.
+  @retval EFI_INVALID_PARAMETER  The input parameters are not correct.
+  @retval EFI_SUCCESS            Get the formset opcode from the hii handle sucessfully.
+
+**/
+EFI_STATUS
+EFIAPI
+HiiGetFormSetFromHiiHandle(
+  IN  EFI_HII_HANDLE     Handle,
+  OUT EFI_IFR_FORM_SET   **Buffer,
+  OUT UINTN              *BufferSize
+  );
+
 /**
   Retrieves a pointer to a Null-terminated ASCII string containing the list 
   of languages that an HII handle in the HII Database supports.  The returned