serial: sh-sci: Remove obsolete comment about overrun detection

The code it refers to was removed in commit b545e4f4 ("serial:
sh-sci: Compute overrun_bit without using baud rate algo").
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/sh-sci.c

@@ -2314,11 +2314,6 @@ static int sci_init_single(struct platform_device *dev,
 	sci_port->error_mask = (p->type == PORT_SCI) ?
 			SCI_DEFAULT_ERROR_MASK : SCIF_DEFAULT_ERROR_MASK;
 
-	/*
-	 * Establish sensible defaults for the overrun detection, unless
-	 * the part has explicitly disabled support for it.
-	 */
-
 	/*
 	 * Make the error mask inclusive of overrun detection, if
 	 * supported.