omap3: introduce omap3_map_io

Most OMAP3-based boards use exactly the same code for .map_io method in
the machine_desc structure.
This patch introduces omap3_map_io and updates board-* files to use it
as .map_io method.

Signed-off-by: Mike Rapoport <mike@compulab.co.il>
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/mach-omap2/board-zoom2.c b/arch/arm/mach-omap2/board-zoom2.c
index 3d2deb4..161f729 100644
--- a/arch/arm/mach-omap2/board-zoom2.c
+++ b/arch/arm/mach-omap2/board-zoom2.c
@@ -84,17 +84,11 @@
 	zoom_debugboard_init();
 }
 
-static void __init omap_zoom2_map_io(void)
-{
-	omap2_set_globals_3xxx();
-	omap34xx_map_common_io();
-}
-
 MACHINE_START(OMAP_ZOOM2, "OMAP Zoom2 board")
 	.phys_io	= ZOOM_UART_BASE,
 	.io_pg_offst	= (ZOOM_UART_VIRT >> 18) & 0xfffc,
 	.boot_params	= 0x80000100,
-	.map_io		= omap_zoom2_map_io,
+	.map_io		= omap3_map_io,
 	.reserve	= omap_reserve,
 	.init_irq	= omap_zoom2_init_irq,
 	.init_machine	= omap_zoom2_init,