omap: mailbox: standarize on 'omap-mailbox'

omap{1,2}-mailbox are modules that provide the 'omap-mailbox' driver.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
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 56e6013..4490240 100644
--- a/arch/arm/mach-omap2/devices.c
+++ b/arch/arm/mach-omap2/devices.c
@@ -209,7 +209,7 @@
 #endif
 
 static struct platform_device mbox_device = {
-	.name		= "omap2-mailbox",
+	.name		= "omap-mailbox",
 	.id		= -1,
 };