Update to v4.19 kernel headers.

Test: Builds and boots.
Change-Id: I99a9ed79666e143b47f02ca4e59eed94f69b7e4a
(cherry picked from commit a981e2e52e2e95a65fa9c9b6fb16dcb4c83dd576)
diff --git a/libc/kernel/uapi/linux/usb/g_uvc.h b/libc/kernel/uapi/linux/usb/g_uvc.h
new file mode 100644
index 0000000..0aeba3d
--- /dev/null
+++ b/libc/kernel/uapi/linux/usb/g_uvc.h
@@ -0,0 +1,44 @@
+/****************************************************************************
+ ****************************************************************************
+ ***
+ ***   This header was automatically generated from a Linux kernel header
+ ***   of the same name, to make information necessary for userspace to
+ ***   call into the kernel available to libc.  It contains only constants,
+ ***   structures, and macros generated from the original header, and thus,
+ ***   contains no copyrightable information.
+ ***
+ ***   To edit the content of this header, modify the corresponding
+ ***   source file (e.g. under external/kernel-headers/original/) then
+ ***   run bionic/libc/kernel/tools/update_all.py
+ ***
+ ***   Any manual change here will be lost the next time this script will
+ ***   be run. You've been warned!
+ ***
+ ****************************************************************************
+ ****************************************************************************/
+#ifndef __LINUX_USB_G_UVC_H
+#define __LINUX_USB_G_UVC_H
+#include <linux/ioctl.h>
+#include <linux/types.h>
+#include <linux/usb/ch9.h>
+#define UVC_EVENT_FIRST (V4L2_EVENT_PRIVATE_START + 0)
+#define UVC_EVENT_CONNECT (V4L2_EVENT_PRIVATE_START + 0)
+#define UVC_EVENT_DISCONNECT (V4L2_EVENT_PRIVATE_START + 1)
+#define UVC_EVENT_STREAMON (V4L2_EVENT_PRIVATE_START + 2)
+#define UVC_EVENT_STREAMOFF (V4L2_EVENT_PRIVATE_START + 3)
+#define UVC_EVENT_SETUP (V4L2_EVENT_PRIVATE_START + 4)
+#define UVC_EVENT_DATA (V4L2_EVENT_PRIVATE_START + 5)
+#define UVC_EVENT_LAST (V4L2_EVENT_PRIVATE_START + 5)
+struct uvc_request_data {
+  __s32 length;
+  __u8 data[60];
+};
+struct uvc_event {
+  union {
+    enum usb_device_speed speed;
+    struct usb_ctrlrequest req;
+    struct uvc_request_data data;
+  };
+};
+#define UVCIOC_SEND_RESPONSE _IOW('U', 1, struct uvc_request_data)
+#endif