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/kexec.h b/libc/kernel/uapi/linux/kexec.h
index 53c86f3..c5c8623 100644
--- a/libc/kernel/uapi/linux/kexec.h
+++ b/libc/kernel/uapi/linux/kexec.h
@@ -14,6 +14,7 @@
 #define KEXEC_FILE_UNLOAD 0x00000001
 #define KEXEC_FILE_ON_CRASH 0x00000002
 #define KEXEC_FILE_NO_INITRAMFS 0x00000004
+#define KEXEC_FILE_DEBUG 0x00000008
 #define KEXEC_ARCH_DEFAULT (0 << 16)
 #define KEXEC_ARCH_386 (3 << 16)
 #define KEXEC_ARCH_68K (4 << 16)