serial: liteuart: remove unused uart_ops stubs

Remove stub uart_ops methods that are not called unconditionally
from serial_core.
Signed-off-by: Gabriel Somlo <gsomlo@gmail.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20221123130500.1030189-4-gsomlo@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/liteuart.c

@@ -154,11 +154,6 @@ static void liteuart_stop_rx(struct uart_port *port)
 	del_timer(&uart->timer);
 }
 
-static void liteuart_break_ctl(struct uart_port *port, int break_state)
-{
-	/* LiteUART doesn't support sending break signal */
-}
-
 static int liteuart_startup(struct uart_port *port)
 {
 	struct liteuart_port *uart = to_liteuart_port(port);
@@ -197,15 +192,6 @@ static const char *liteuart_type(struct uart_port *port)
 	return "liteuart";
 }
 
-static void liteuart_release_port(struct uart_port *port)
-{
-}
-
-static int liteuart_request_port(struct uart_port *port)
-{
-	return 0;
-}
-
 static void liteuart_config_port(struct uart_port *port, int flags)
 {
 	/*
@@ -232,13 +218,10 @@ static const struct uart_ops liteuart_ops = {
 	.stop_tx	= liteuart_stop_tx,
 	.start_tx	= liteuart_start_tx,
 	.stop_rx	= liteuart_stop_rx,
-	.break_ctl	= liteuart_break_ctl,
 	.startup	= liteuart_startup,
 	.shutdown	= liteuart_shutdown,
 	.set_termios	= liteuart_set_termios,
 	.type		= liteuart_type,
-	.release_port	= liteuart_release_port,
-	.request_port	= liteuart_request_port,
 	.config_port	= liteuart_config_port,
 	.verify_port	= liteuart_verify_port,
 };