Add "TtyTerm" terminal type to TerminalDxe

This patch a adds new terminal type, TtyTerm, to TerminalDxe.  This terminal
type provides a place to add support for various *nix terminals that don't
behave like standard VT terminals.  The goal is to 'just work' with as many
terminals as possible, rather than properly emulating any one specific
terminal.

Signed-off-by: Roy Franz <roy.franz@linaro.org>
Contributed-under: TianoCore Contribution Agreement 1.0
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Feng Tian <feng.tian@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17895 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Universal/Console/TerminalDxe/TerminalConOut.c

@@ -223,6 +223,7 @@ TerminalConOutOutputString (
     case PCANSITYPE:
     case VT100TYPE:
     case VT100PLUSTYPE:
+    case TTYTERMTYPE:
 
       if (!TerminalIsValidTextGraphics (*WString, &GraphicChar, &AsciiChar)) {
         //
@@ -371,6 +372,7 @@ TerminalConOutTestString (
   case PCANSITYPE:
   case VT100TYPE:
   case VT100PLUSTYPE:
+  case TTYTERMTYPE:
     Status = AnsiTestString (TerminalDevice, WString);
     break;