add support to easily remove profiles and shell levels. the libraries will not do anything (but no longer fail), if the PCDs are changed to remove their functionality.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11666 6f19259b-4bc3-4df7-8a09-765794883524

ShellPkg/Library/UefiShellLevel3CommandsLib/UefiShellLevel3CommandsLib.c

@@ -57,7 +57,7 @@ ShellLevel3CommandsLibConstructor (
   // if shell level is less than 3 do nothing
   //
   if (PcdGet8(PcdShellSupportLevel) < 3) {
-    return (EFI_UNSUPPORTED);
+    return (EFI_SUCCESS);
   }
 
   gShellLevel3HiiHandle = HiiAddPackages (&gShellLevel3HiiGuid, gImageHandle, UefiShellLevel3CommandsLibStrings, NULL);