mailbox: omap: Move omap_mbox_irq_t into driver

This is only used internal to the driver, move it out of the
public header and into the driver file. While we are here,
this is not used as a bitwise, so drop that and make it a
simple enum type.
Signed-off-by: Andrew Davis <afd@ti.com>
Signed-off-by: Jassi Brar <jassisinghbrar@gmail.com>

drivers/mailbox/omap-mailbox.c

@@ -51,6 +51,11 @@
 #define MBOX_INTR_CFG_TYPE1		0
 #define MBOX_INTR_CFG_TYPE2		1
 
+typedef enum {
+	IRQ_TX = 1,
+	IRQ_RX = 2,
+} omap_mbox_irq_t;
+
 struct omap_mbox_fifo {
 	unsigned long msg;
 	unsigned long fifo_stat;

include/linux/omap-mailbox.h

@@ -10,8 +10,4 @@ typedef uintptr_t mbox_msg_t;
 
 #define omap_mbox_message(data) (u32)(mbox_msg_t)(data)
 
-typedef int __bitwise omap_mbox_irq_t;
-#define IRQ_TX ((__force omap_mbox_irq_t) 1)
-#define IRQ_RX ((__force omap_mbox_irq_t) 2)
-
 #endif /* OMAP_MAILBOX_H */