MdeModulePke/Mtftp4Dxe: Support windowsize in read request operation.

Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=886

This patch is to support the TFTP windowsize option described in RFC 7440.
The feature allows the client and server to negotiate a window size of
consecutive blocks to send as an alternative for replacing the single-block
lockstep schema.

Currently, the windowsize for write request operation is not supported since
there is no real use cases.

Cc: Ye Ting <ting.ye@intel.com>
Cc: Fu Siyuan <siyuan.fu@intel.com>
Cc: Shao Ming <ming.shao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Wu Jiaxin <jiaxin.wu@intel.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Fu Siyuan <siyuan.fu@intel.com>
Reviewed-by: Ye Ting <ting.ye@intel.com>

MdeModulePkg/Universal/Network/Mtftp4Dxe/Mtftp4Wrq.c

@@ -286,7 +286,7 @@ Mtftp4WrqHandleOack (
   // Parse and validate the options from server
   //
   ZeroMem (&Reply, sizeof (MTFTP4_OPTION));
-  Status = Mtftp4ParseOptionOack (Packet, Len, &Reply);
+  Status = Mtftp4ParseOptionOack (Packet, Len, Instance->Operation, &Reply);
 
   if (EFI_ERROR (Status) || !Mtftp4WrqOackValid (&Reply, &Instance->RequestOption)) {
     //