usb: musb: mark ->set_clock deprecated

... we will completely drop that need by
moving clock handling to platform glue
layer. Marking as deprecated will allow
us to catch all users easily.

Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/include/linux/usb/musb.h b/include/linux/usb/musb.h
index 6f4e501..0b72b57 100644
--- a/include/linux/usb/musb.h
+++ b/include/linux/usb/musb.h
@@ -119,7 +119,7 @@
 	int		(*set_power)(int state);
 
 	/* Turn device clock on or off */
-	int		(*set_clock)(struct clk *clock, int is_on);
+	int		(*set_clock)(struct clk *clock, int is_on) __deprecated;
 
 	/* MUSB configuration-specific details */
 	struct musb_hdrc_config	*config;