ShellPkg: Add optional 'tftp' EFI Shell command

This 'tftp' command allows to download a file from a TFTP server.
A specific network interface can be chosen in case there are multiple 
interfaces.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ronald Cron <Ronald.Cron@arm.com>
Reviewed-by: Olivier Martin <Olivier.Martin@arm.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>



git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18015 6f19259b-4bc3-4df7-8a09-765794883524

ShellPkg/ShellPkg.dsc

@@ -98,6 +98,9 @@
 !ifdef $(INCLUDE_DP)
       NULL|ShellPkg/Library/UefiDpLib/UefiDpLib.inf
 !endif #$(INCLUDE_DP)
+!ifdef $(INCLUDE_TFTP_COMMAND)
+      NULL|ShellPkg/Library/UefiShellTftpCommandLib/UefiShellTftpCommandLib.inf
+!endif #$(INCLUDE_TFTP_COMMAND)
 !endif #$(NO_SHELL_PROFILES)
   }