omap mailbox: fix empty struct device for omap1

Signed-off-by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>

diff --git a/arch/arm/mach-omap1/devices.c b/arch/arm/mach-omap1/devices.c
index ba5d7c0..bbbaeb0 100644
--- a/arch/arm/mach-omap1/devices.c
+++ b/arch/arm/mach-omap1/devices.c
@@ -86,7 +86,7 @@
 };
 
 static struct platform_device mbox_device = {
-	.name		= "mailbox",
+	.name		= "omap1-mailbox",
 	.id		= -1,
 	.num_resources	= ARRAY_SIZE(mbox_resources),
 	.resource	= mbox_resources,