Update to v6.0 kernel headers.

Kernel headers coming from:

Git: https://android.googlesource.com/kernel/common/
Branch: android-mainline
Tag: android-mainline-6.0

Test: Boots on coral.
Test: Bionic unit tests pass.
Change-Id: I282de83f23b432bef58214108a93700bdadddf0f
diff --git a/libc/kernel/uapi/linux/random.h b/libc/kernel/uapi/linux/random.h
index 2d3cfef..8df411b 100644
--- a/libc/kernel/uapi/linux/random.h
+++ b/libc/kernel/uapi/linux/random.h
@@ -31,7 +31,7 @@
 struct rand_pool_info {
   int entropy_count;
   int buf_size;
-  __u32 buf[0];
+  __u32 buf[];
 };
 #define GRND_NONBLOCK 0x0001
 #define GRND_RANDOM 0x0002