Update to v6.9 kernel headers.

Kernel headers coming from:

Git: https://android.googlesource.com/kernel/common/
Branch: android-mainline
Tag: android-mainline-6.9

Test: Builds and bionic unit tests pass on raven.
Test: Able to log in to an Android GO 32 bit device.
Change-Id: If53a38bbb65c3c653ce790fe5c6e51597901a14e
diff --git a/libc/kernel/uapi/linux/user_events.h b/libc/kernel/uapi/linux/user_events.h
index 7bff0b0..37bf66b 100644
--- a/libc/kernel/uapi/linux/user_events.h
+++ b/libc/kernel/uapi/linux/user_events.h
@@ -9,11 +9,13 @@
 #include <linux/types.h>
 #include <linux/ioctl.h>
 #define USER_EVENTS_SYSTEM "user_events"
+#define USER_EVENTS_MULTI_SYSTEM "user_events_multi"
 #define USER_EVENTS_PREFIX "u:"
 #define DYN_LOC(offset,size) ((size) << 16 | (offset))
 enum user_reg_flag {
   USER_EVENT_REG_PERSIST = 1U << 0,
-  USER_EVENT_REG_MAX = 1U << 1,
+  USER_EVENT_REG_MULTI_FORMAT = 1U << 1,
+  USER_EVENT_REG_MAX = 1U << 2,
 };
 struct user_reg {
   __u32 size;