Update to v5.18 kernel headers.

Kernel headers coming from:

Git: https://android.googlesource.com/kernel/common/
Branch: android-mainline
Tag: android-mainline-5.18

The file bionic/libc/kernel/uapi/linux/android/binder.h had a bug
in the original 5.18 kernel headers. This was fixed upstream, so
add a comment to the structure but leave the incorrect field the
same as the 5.17 kernel headers.

Bug: 234125620

Test: Builds.
Test: All bionic unit tests pass on a coral device.
Test: Able to log in to wembley system.
Change-Id: Ia72cafbe71fd894c599e15aa5334d7bbcbe74778
diff --git a/libc/kernel/uapi/linux/rseq.h b/libc/kernel/uapi/linux/rseq.h
index ba0ceb1..29a9457 100644
--- a/libc/kernel/uapi/linux/rseq.h
+++ b/libc/kernel/uapi/linux/rseq.h
@@ -47,22 +47,7 @@
 struct rseq {
   __u32 cpu_id_start;
   __u32 cpu_id;
-  union {
-    __u64 ptr64;
-#ifdef __LP64__
-    __u64 ptr;
-#else
-    struct {
-#if defined(__BYTE_ORDER) && __BYTE_ORDER == __BIG_ENDIAN || defined(__BIG_ENDIAN)
-      __u32 padding;
-      __u32 ptr32;
-#else
-      __u32 ptr32;
-      __u32 padding;
-#endif
-    } ptr;
-#endif
-  } rseq_cs;
+  __u64 rseq_cs;
   __u32 flags;
 } __attribute__((aligned(4 * sizeof(__u64))));
 #endif