usb: musb-new: Call musb_platform_exit from musb_stop

musb stop is musb core call during unregister or shutting down
gadget or host musb. For graceful exit add musb_platform_exit
on musb_stop so-that it can exit the musb platform driver as well.

Tested-by: Chen-Yu Tsai <wens@csie.org> # A33-OlinuXino
Tested-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
diff --git a/drivers/usb/musb-new/musb_core.c b/drivers/usb/musb-new/musb_core.c
index 8fec6f3..afea9fb 100644
--- a/drivers/usb/musb-new/musb_core.c
+++ b/drivers/usb/musb-new/musb_core.c
@@ -1007,6 +1007,7 @@
 	 *  - ...
 	 */
 	musb_platform_try_idle(musb, 0);
+	musb_platform_exit(musb);
 }
 
 #ifndef __UBOOT__