sh: magicpanelr2 and dreamcast can use the generic I/O base.

There is now no need for the magicpanelr2 and dreamcast platforms to set
their own I/O port bas values, given that the generic machvec code now
sets this to P2SEG for everyone.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

arch/sh/boards/board-magicpanelr2.c

@@ -205,8 +205,6 @@ static void __init setup_port_multiplexing(void)
 
 static void __init mpr2_setup(char **cmdline_p)
 {
-	__set_io_port_base(0xa0000000);
-
 	/* set Pin Select Register A:
 	 * /PCC_CD1, /PCC_CD2,  PCC_BVD1, PCC_BVD2,
 	 * /IOIS16,  IRQ4,	IRQ5,	  USB1d_SUSPEND

arch/sh/boards/mach-dreamcast/setup.c

@@ -42,8 +42,6 @@ static void __init dreamcast_setup(char **cmdline_p)
 	/* Acknowledge any previous events */
 	/* XXX */
 
-	__set_io_port_base(0xa0000000);
-
 	/* Assign all virtual IRQs to the System ASIC int. handler */
 	for (i = HW_EVENT_IRQ_BASE; i < HW_EVENT_IRQ_MAX; i++)
 		set_irq_chip_and_handler(i, &systemasic_int,