ArmPkg/BdsLib: Fixed TFTP and PXE Boot

- An Ascii filename must be passed to the TFTP service (was a Unicode filename)
- If the PXE service had already configured the connection we need to restart
when we want to download a new file or do a do a PXE Boot.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14195 6f19259b-4bc3-4df7-8a09-765794883524

ArmPkg/Library/BdsLib/BdsLib.inf

@@ -65,6 +65,7 @@
   gEfiDiskIoProtocolGuid
   gEfiUsbIoProtocolGuid
   gEfiLoadedImageProtocolGuid
+  gEfiSimpleNetworkProtocolGuid
     
 [FeaturePcd]
   gArmTokenSpaceGuid.PcdArmPsciSupport