arch/s390/setup: Drop dummy_con initialization

con_init in tty/vt.c will now set conswitchp to dummy_con if it's unset.
Drop it from arch setup code.
Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Link: https://lore.kernel.org/r/20191218214506.49252-20-nivedita@alum.mit.eduSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

arch/s390/kernel/setup.c

@@ -241,8 +241,6 @@ static void __init conmode_default(void)
 		SET_CONSOLE_SCLP;
 #endif
 	}
-	if (IS_ENABLED(CONFIG_VT) && IS_ENABLED(CONFIG_DUMMY_CONSOLE))
-		conswitchp = &dummy_con;
 }
 
 #ifdef CONFIG_CRASH_DUMP