omap mailbox: fix empty struct device for omap2

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

diff --git a/arch/arm/mach-omap2/devices.c b/arch/arm/mach-omap2/devices.c
index d5f2a81..14537ff 100644
--- a/arch/arm/mach-omap2/devices.c
+++ b/arch/arm/mach-omap2/devices.c
@@ -61,7 +61,7 @@
 };
 
 static struct platform_device mbox_device = {
-	.name		= "mailbox",
+	.name		= "omap2-mailbox",
 	.id		= -1,
 };