usb: musb: fix Kconfig

After 622859634 (usb: musb: drop a gigantic amount of ifdeferry):

 - USB_GADGET_MUSB_HDRC is no longer selectable because it
   depends on the removed USB_MUSB_PERIPHERAL and USB_MUSB_OTG
   options

 - The Kconfig comment still says "Enable Host or Gadget support
   to see Inventra options", even though you now need to enable
   both of them to see Inventra options.

Fix the dependency and drop the anyway unnecessary comment.

Signed-off-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 44b6b40..5a084b9 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -310,7 +310,7 @@
 # musb builds in ../musb along with host support
 config USB_GADGET_MUSB_HDRC
 	tristate "Inventra HDRC USB Peripheral (TI, ADI, ...)"
-	depends on USB_MUSB_HDRC && (USB_MUSB_PERIPHERAL || USB_MUSB_OTG)
+	depends on USB_MUSB_HDRC
 	select USB_GADGET_DUALSPEED
 	help
 	  This OTG-capable silicon IP is used in dual designs including