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/UefiShellLevel2CommandsLib/UefiShellLevel2CommandsLib.c

@@ -77,7 +77,7 @@ ShellLevel2CommandsLibConstructor (
   // if shell level is less than 2 do nothing
   //
   if (PcdGet8(PcdShellSupportLevel) < 2) {
-    return (EFI_UNSUPPORTED);
+    return (EFI_SUCCESS);
   }
 
   gShellLevel2HiiHandle = HiiAddPackages (&gShellLevel2HiiGuid, gImageHandle, UefiShellLevel2CommandsLibStrings, NULL);