NetworkPkg:Replace unsafe string functions.

Replace unsafe string functions with new added safe string functions.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Zhang Lubo <lubo.zhang@intel.com>
Reviewed-by: Fu Siyuan <siyuan.fu@intel.com>
Reviewed-by: Qiu Shumin <shumin.qiu@intel.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17887 6f19259b-4bc3-4df7-8a09-765794883524

NetworkPkg/UefiPxeBcDxe/PxeBcSupport.h

@@ -448,14 +448,16 @@ PxeBcUintnToAscDecWithFormat (
 
   @param[in]  Number         Numeric value to be converted.
   @param[in]  Buffer         Pointer to the buffer for ASCII string.
-
+  @param[in]  BufferSize     The maxsize of the buffer.
+  
   @return     Length         The actual length of the ASCII string.
 
 **/
 UINTN
 PxeBcUintnToAscDec (
   IN UINTN               Number,
-  IN UINT8               *Buffer
+  IN UINT8               *Buffer,
+  IN UINTN               BufferSize
   );
 
 /**