Update to v6.8 kernel headers.

Kernel headers coming from:

Git: https://android.googlesource.com/kernel/common/
Branch: android-mainline
Tag: android-mainline-6.8

Test: Builds and bionic unit tests pass on raven.
Test: Able to log in to an Android GO 32 bit device.
Change-Id: I0022cdb20c19726f526acaab2866f1e25794b77e
diff --git a/libc/kernel/uapi/linux/sync_file.h b/libc/kernel/uapi/linux/sync_file.h
index 423d248..bde8c16 100644
--- a/libc/kernel/uapi/linux/sync_file.h
+++ b/libc/kernel/uapi/linux/sync_file.h
@@ -30,7 +30,12 @@
   __u32 pad;
   __u64 sync_fence_info;
 };
+struct sync_set_deadline {
+  __u64 deadline_ns;
+  __u64 pad;
+};
 #define SYNC_IOC_MAGIC '>'
 #define SYNC_IOC_MERGE _IOWR(SYNC_IOC_MAGIC, 3, struct sync_merge_data)
 #define SYNC_IOC_FILE_INFO _IOWR(SYNC_IOC_MAGIC, 4, struct sync_file_info)
+#define SYNC_IOC_SET_DEADLINE _IOW(SYNC_IOC_MAGIC, 5, struct sync_set_deadline)
 #endif