drivers/usb: regorganisation

move to linux usb driver organisation

as following

drivers/usb/gadget
drivers/usb/host
drivers/usb/musb

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Remy Bohmer <linux@bohmer.net>
diff --git a/Makefile b/Makefile
index 49b83c0..e91c051 100644
--- a/Makefile
+++ b/Makefile
@@ -263,7 +263,9 @@
 LIBS += drivers/rtc/librtc.a
 LIBS += drivers/serial/libserial.a
 LIBS += drivers/twserial/libtws.a
-LIBS += drivers/usb/libusb.a
+LIBS += drivers/usb/gadget/libusb_gadget.a
+LIBS += drivers/usb/host/libusb_host.a
+LIBS += drivers/usb/musb/libusb_musb.a
 LIBS += drivers/video/libvideo.a
 LIBS += drivers/watchdog/libwatchdog.a
 LIBS += common/libcommon.a