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/batman_adv.h b/libc/kernel/uapi/linux/batman_adv.h
index 96b259b..9f48dac 100644
--- a/libc/kernel/uapi/linux/batman_adv.h
+++ b/libc/kernel/uapi/linux/batman_adv.h
@@ -144,4 +144,10 @@
   BATADV_TP_REASON_CANT_SEND = 132,
   BATADV_TP_REASON_TOO_MANY = 133,
 };
+enum batadv_ifla_attrs {
+  IFLA_BATADV_UNSPEC,
+  IFLA_BATADV_ALGO_NAME,
+  __IFLA_BATADV_MAX,
+};
+#define IFLA_BATADV_MAX (__IFLA_BATADV_MAX - 1)
 #endif