usb: gadget: use config_ep_by_speed() instead of ep_choose()

Remove obsolete functions:
1. ep_choose()
2. usb_find_endpoint()

Signed-off-by: Tatyana Brokhman <tlinder@codeaurora.org>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/gadget/f_sourcesink.c b/drivers/usb/gadget/f_sourcesink.c
index 0ffddd3..caf2f95 100644
--- a/drivers/usb/gadget/f_sourcesink.c
+++ b/drivers/usb/gadget/f_sourcesink.c
@@ -347,7 +347,9 @@
 
 	/* one endpoint writes (sources) zeroes IN (to the host) */
 	ep = ss->in_ep;
-	ep->desc = ep_choose(cdev->gadget, &hs_source_desc, &fs_source_desc);
+	result = config_ep_by_speed(cdev->gadget, &(ss->function), ep);
+	if (result)
+		return result;
 	result = usb_ep_enable(ep);
 	if (result < 0)
 		return result;
@@ -364,7 +366,9 @@
 
 	/* one endpoint reads (sinks) anything OUT (from the host) */
 	ep = ss->out_ep;
-	ep->desc = ep_choose(cdev->gadget, &hs_sink_desc, &fs_sink_desc);
+	result = config_ep_by_speed(cdev->gadget, &(ss->function), ep);
+	if (result)
+		goto fail;
 	result = usb_ep_enable(ep);
 	if (result < 0)
 		goto fail;