Update to v5.11 kernel headers.

Kernel headers coming from:

Git: https://android.googlesource.com/kernel/common/
Branch: android-mainline
Tag: android-mainline-5.11

Test: Built cuttlefish and flame images. Ran bionic unit tests on both.
Change-Id: Ie60337aafad4bda55af99b6c8fe9f56bf2fa787f
diff --git a/libc/kernel/uapi/linux/bcache.h b/libc/kernel/uapi/linux/bcache.h
index 09335c8..25b6987 100644
--- a/libc/kernel/uapi/linux/bcache.h
+++ b/libc/kernel/uapi/linux/bcache.h
@@ -100,7 +100,7 @@
     __le16 keys;
   };
   __le64 d[SB_JOURNAL_BUCKETS];
-  __le16 bucket_size_hi;
+  __le16 obso_bucket_size_hi;
 };
 struct cache_sb {
   __u64 offset;