sh: board-shmin: Convert shmin to use __set_io_port_base().

Drop the special mv_ioport_map() implementation, as this can simply use
__set_io_port_base() directly.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/boards/board-shmin.c

@@ -22,21 +22,13 @@ static void __init init_shmin_irq(void)
 	plat_irq_setup_pins(IRQ_MODE_IRQ);
 }
 
-static void __iomem *shmin_ioport_map(unsigned long port, unsigned int size)
+static void __init shmin_setup(char **cmdline_p)
 {
-	static int dummy;
-
-	if ((port & ~0x1f) == SHMIN_NE_BASE)
-		return (void __iomem *)(SHMIN_IO_BASE + port);
-
-	dummy = 0;
-
-	return &dummy;
-
+	__set_io_port_base(SHMIN_IO_BASE);
 }
 
 static struct sh_machine_vector mv_shmin __initmv = {
 	.mv_name	= "SHMIN",
+	.mv_setup	= shmin_setup,
 	.mv_init_irq	= init_shmin_irq,
-	.mv_ioport_map	= shmin_ioport_map,
 };