Update to v5.7 kernel headers.

Kernel headers coming from:

Git: https://android.googlesource.com/kernel/common/
Branch: android-mainline
Tag: android-mainline-5.7

Update the generate_uapi_headers.sh where the types.h file is now in
the right place, but kvm.h is not.

Test: Booted cuttlefish/bonito.
Test: Ran bionic-unit-tests on cuttlefish/bonito.
Change-Id: Ice9ce370a658e320b80f564b34a4431927fcf100
diff --git a/libc/kernel/uapi/linux/virtio_balloon.h b/libc/kernel/uapi/linux/virtio_balloon.h
index 806e757..80affd8 100644
--- a/libc/kernel/uapi/linux/virtio_balloon.h
+++ b/libc/kernel/uapi/linux/virtio_balloon.h
@@ -27,13 +27,17 @@
 #define VIRTIO_BALLOON_F_DEFLATE_ON_OOM 2
 #define VIRTIO_BALLOON_F_FREE_PAGE_HINT 3
 #define VIRTIO_BALLOON_F_PAGE_POISON 4
+#define VIRTIO_BALLOON_F_REPORTING 5
 #define VIRTIO_BALLOON_PFN_SHIFT 12
 #define VIRTIO_BALLOON_CMD_ID_STOP 0
 #define VIRTIO_BALLOON_CMD_ID_DONE 1
 struct virtio_balloon_config {
   __u32 num_pages;
   __u32 actual;
-  __u32 free_page_report_cmd_id;
+  union {
+    __u32 free_page_hint_cmd_id;
+    __u32 free_page_report_cmd_id;
+  };
   __u32 poison_val;
 };
 #define VIRTIO_BALLOON_S_SWAP_IN 0