staging: emxx_udc: Fix build error

‘strict_strtol’ is deprecated. Use kstrtol instead. Fixes the following
build error:
drivers/staging/emxx_udc/emxx_udc.c:3288:3: error: implicit declaration of function ‘strict_strtol’
Signed-off-by: Sachin Kamat <sachin.kamat@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/emxx_udc/emxx_udc.c

@@ -3285,7 +3285,7 @@ static void __init nbu2ss_drv_set_ep_info(
 
 		tempbuf[0] = name[2];
 		tempbuf[1] = '\0';
-		res = strict_strtol(tempbuf, 16, &num);
+		res = kstrtol(tempbuf, 16, &num);
 
 		if (num == 0)
 			ep->ep.maxpacket = EP0_PACKETSIZE;