usb-*.c -> hw/usb/

Change-Id: I5b07162013d6d3bb0f8dfbf026a016058ca32af6
diff --git a/Makefile.common b/Makefile.common
index 8402191..f8497f6 100644
--- a/Makefile.common
+++ b/Makefile.common
@@ -484,11 +484,11 @@
 endif
 
 ifeq ($(HOST_OS),linux)
-    CORE_MISC_SOURCES += usb-linux.c \
+    CORE_MISC_SOURCES += hw/usb/usb-linux.c \
                          util/qemu-thread.c \
                          android/camera/camera-capture-linux.c
 else
-    CORE_MISC_SOURCES += usb-dummy-android.c
+    CORE_MISC_SOURCES += hw/usb/usb-dummy-android.c
 endif
 
 ifeq ($(HOST_OS),windows)