Update to v5.15 kernel headers.

Kernel headers coming from:

Git: https://android.googlesource.com/kernel/common/
Branch: android-mainline
Tag: android-mainline-5.15

Test: Builds, and ran bionic unit tests on flame.
Change-Id: I86901ea6d89fb0f7384b90a47bef35d194083c24
diff --git a/libc/kernel/uapi/linux/xfrm.h b/libc/kernel/uapi/linux/xfrm.h
index b0e930c..e40b7e3 100644
--- a/libc/kernel/uapi/linux/xfrm.h
+++ b/libc/kernel/uapi/linux/xfrm.h
@@ -182,6 +182,10 @@
 #define XFRM_MSG_GETSPDINFO XFRM_MSG_GETSPDINFO
   XFRM_MSG_MAPPING,
 #define XFRM_MSG_MAPPING XFRM_MSG_MAPPING
+  XFRM_MSG_SETDEFAULT,
+#define XFRM_MSG_SETDEFAULT XFRM_MSG_SETDEFAULT
+  XFRM_MSG_GETDEFAULT,
+#define XFRM_MSG_GETDEFAULT XFRM_MSG_GETDEFAULT
   __XFRM_MSG_MAX
 };
 #define XFRM_MSG_MAX (__XFRM_MSG_MAX - 1)
@@ -430,6 +434,14 @@
 };
 #define XFRM_OFFLOAD_IPV6 1
 #define XFRM_OFFLOAD_INBOUND 2
+struct xfrm_userpolicy_default {
+#define XFRM_USERPOLICY_UNSPEC 0
+#define XFRM_USERPOLICY_BLOCK 1
+#define XFRM_USERPOLICY_ACCEPT 2
+  __u8 in;
+  __u8 fwd;
+  __u8 out;
+};
 #define XFRMGRP_ACQUIRE 1
 #define XFRMGRP_EXPIRE 2
 #define XFRMGRP_SA 4