TTY: switch tty_insert_flip_char

Now, we start converting tty buffer functions to actually use
tty_port. This will allow us to get rid of the need of tty in many
call sites. Only tty_port will needed and hence no more
tty_port_tty_get in those paths.

tty_insert_flip_char is the next one to proceed. This one is used all
over the code, so the patch is huge.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/s390/char/con3215.c b/drivers/s390/char/con3215.c
index 4008450..7c72945 100644
--- a/drivers/s390/char/con3215.c
+++ b/drivers/s390/char/con3215.c
@@ -411,7 +411,8 @@
 				break;
 
 			case CTRLCHAR_CTRL:
-				tty_insert_flip_char(tty, cchar, TTY_NORMAL);
+				tty_insert_flip_char(&raw->port, cchar,
+						TTY_NORMAL);
 				tty_flip_buffer_push(tty);
 				break;