subsys: usb: Remove undefined CONFIG_USB_DEVICE_HID_BOOTP

The Kconfig symbol CONFIG_USB_DEVICE_HID_BOOTP isn't defined anywhere,
so remove dead code associated with it.

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
diff --git a/subsys/usb/usb_descriptor.h b/subsys/usb/usb_descriptor.h
index 421e333..c6e3d6a 100644
--- a/subsys/usb/usb_descriptor.h
+++ b/subsys/usb/usb_descriptor.h
@@ -42,13 +42,8 @@
 #endif
 
 #ifdef CONFIG_USB_DEVICE_HID
-#ifdef CONFIG_USB_DEVICE_HID_BOOTP
-#define NUMOF_IFACES_HID		2
-#define NUMOF_ENDPOINTS_HID		2
-#else /* CONFIG_USB_DEVICE_HID_BOOTP */
 #define NUMOF_IFACES_HID		1
 #define NUMOF_ENDPOINTS_HID		1
-#endif /* CONFIG_USB_DEVICE_HID_BOOTP */
 #else /* CONFIG_USB_DEVICE_HID */
 #define NUMOF_IFACES_HID		0
 #define NUMOF_ENDPOINTS_HID		0