usb: dfu: add fullspeed support for DFU

DFU now can use also fullspeed.

Signed-off-by: Heiko Schocher <hs@denx.de>
Cc: Tom Rini <trini@ti.com>
Cc: Lukasz Majewski <l.majewski@samsung.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Liu Bin <b-liu@ti.com>
Cc: Lukas Stockmann <lukas.stockmann@siemens.com>

drivers/usb/gadget/f_dfu.c

@@ -229,6 +229,7 @@ static inline void to_dfu_mode(struct f_dfu *f_dfu)
 {
 	f_dfu->usb_function.strings = dfu_strings;
 	f_dfu->usb_function.hs_descriptors = f_dfu->function;
+	f_dfu->usb_function.descriptors = f_dfu->function;
 	f_dfu->dfu_state = DFU_STATE_dfuIDLE;
 }
 
@@ -236,6 +237,7 @@ static inline void to_runtime_mode(struct f_dfu *f_dfu)
 {
 	f_dfu->usb_function.strings = NULL;
 	f_dfu->usb_function.hs_descriptors = dfu_runtime_descs;
+	f_dfu->usb_function.descriptors = dfu_runtime_descs;
 }
 
 static int handle_upload(struct usb_request *req, u16 len)
@@ -800,6 +802,7 @@ static int dfu_bind_config(struct usb_configuration *c)
 		return -ENOMEM;
 	f_dfu->usb_function.name = "dfu";
 	f_dfu->usb_function.hs_descriptors = dfu_runtime_descs;
+	f_dfu->usb_function.descriptors = dfu_runtime_descs;
 	f_dfu->usb_function.bind = dfu_bind;
 	f_dfu->usb_function.unbind = dfu_unbind;
 	f_dfu->usb_function.set_alt = dfu_set_alt;