Update to v5.13 kernel headers.

Kernel headers coming from:

Git: https://android.googlesource.com/kernel/common/
Branch: android-mainline
Tag: android-mainline-5.13

Test: Builds, bionic unit tests.
Change-Id: Ia4360ca4a2808206f64187dcb234d73c5752624b
diff --git a/libc/kernel/uapi/linux/virtio_bt.h b/libc/kernel/uapi/linux/virtio_bt.h
new file mode 100644
index 0000000..7e29eaa
--- /dev/null
+++ b/libc/kernel/uapi/linux/virtio_bt.h
@@ -0,0 +1,40 @@
+/****************************************************************************
+ ****************************************************************************
+ ***
+ ***   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 _UAPI_LINUX_VIRTIO_BT_H
+#define _UAPI_LINUX_VIRTIO_BT_H
+#include <linux/virtio_types.h>
+#define VIRTIO_BT_F_VND_HCI 0
+#define VIRTIO_BT_F_MSFT_EXT 1
+#define VIRTIO_BT_F_AOSP_EXT 2
+enum virtio_bt_config_type {
+  VIRTIO_BT_CONFIG_TYPE_PRIMARY = 0,
+  VIRTIO_BT_CONFIG_TYPE_AMP = 1,
+};
+enum virtio_bt_config_vendor {
+  VIRTIO_BT_CONFIG_VENDOR_NONE = 0,
+  VIRTIO_BT_CONFIG_VENDOR_ZEPHYR = 1,
+  VIRTIO_BT_CONFIG_VENDOR_INTEL = 2,
+  VIRTIO_BT_CONFIG_VENDOR_REALTEK = 3,
+};
+struct virtio_bt_config {
+  __u8 type;
+  __u16 vendor;
+  __u16 msft_opcode;
+} __attribute__((packed));
+#endif