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-am3517evm.c b/arch/arm/mach-omap2/board-am3517evm.c
index 4356424..4d0f585 100644
--- a/arch/arm/mach-omap2/board-am3517evm.c
+++ b/arch/arm/mach-omap2/board-am3517evm.c
@@ -461,17 +461,11 @@
 	am3517_evm_ethernet_init(&am3517_evm_emac_pdata);
 }
 
-static void __init am3517_evm_map_io(void)
-{
-	omap2_set_globals_3xxx();
-	omap34xx_map_common_io();
-}
-
 MACHINE_START(OMAP3517EVM, "OMAP3517/AM3517 EVM")
 	.phys_io	= 0x48000000,
 	.io_pg_offst	= ((0xd8000000) >> 18) & 0xfffc,
 	.boot_params	= 0x80000100,
-	.map_io		= am3517_evm_map_io,
+	.map_io		= omap3_map_io,
 	.reserve	= omap_reserve,
 	.init_irq	= am3517_evm_init_irq,
 	.init_machine	= am3517_evm_init,