omap1: mailbox: kill compile warning

use ioremap and remove unused variable to get rid
of compile warnings.

Signed-off-by: Felipe Balbi <felipe.balbi@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/mach-omap1/devices.c b/arch/arm/mach-omap1/devices.c
index a2d07aa..379100c 100644
--- a/arch/arm/mach-omap1/devices.c
+++ b/arch/arm/mach-omap1/devices.c
@@ -73,7 +73,7 @@
 #  define INT_DSP_MAILBOX1	INT_1610_DSP_MAILBOX1
 #endif
 
-#define OMAP1_MBOX_BASE		OMAP1_IO_ADDRESS(OMAP16XX_MAILBOX_BASE)
+#define OMAP1_MBOX_BASE		OMAP16XX_MAILBOX_BASE
 
 static struct resource mbox_resources[] = {
 	{