linux-user: Define ordinary usbfs ioctls.

Provide ioctl definitions for the generic thunk mechanism to
convert most usbfs calls.  Calculate arg size at runtime.

Signed-off-by: Cortland Tölva <cst@tolva.net>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20181008163521.17341-3-cst@tolva.net>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index d2cc971..6eb20c1 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -94,6 +94,9 @@
 #include <linux/fiemap.h>
 #endif
 #include <linux/fb.h>
+#if defined(CONFIG_USBFS)
+#include <linux/usbdevice_fs.h>
+#endif
 #include <linux/vt.h>
 #include <linux/dm-ioctl.h>
 #include <linux/reboot.h>