usb: musb: drop __deprecated flag

Looks like we cannot live without that double_buffer_not_ok
flag due to many HW bugs this MUSB core has.

So, let's drop the __deprecated flag to avoid annoying
compile warnings.
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/musb/musb_core.h

@@ -449,7 +449,7 @@ struct musb {
 	 * We added this flag to forcefully disable double
 	 * buffering until we get it working.
 	 */
-	unsigned                double_buffer_not_ok:1 __deprecated;
+	unsigned                double_buffer_not_ok:1;
 
 	struct musb_hdrc_config	*config;