usb: gadget: update os_desc_config when add config

Always use the new added config for os_desc_config to fix cdev->
os_desc_config may miss set in case we restart usb gadget driver.

Signed-off-by: Li Jun <jun.li@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index e6fdefd..404da12 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -512,8 +512,8 @@
 
 	usb_ep_autoconfig_reset(cdev->gadget);
 
-	if (os_desc_config)
-		cdev->os_desc_config = os_desc_config;
+	os_desc_config = config;
+	cdev->os_desc_config = os_desc_config;
 
 done:
 	if (status)