Update to v5.5 kernel headers.

Kernel headers coming from:

Git: https://android.googlesource.com/kernel/common/
Branch: android-mainline
Tag: android-mainline-5.5

Test: Boots on walleye.
Test: Ran bionic-unit-tests on walleye.
Test: Boots on cuttlefish.
Test: Ran bionic-unit-tests on cuttlefish.
Change-Id: I57387d3c31e0ba5ad125ffe291cecf365c7b374e
diff --git a/libc/kernel/uapi/asm-generic/sembuf.h b/libc/kernel/uapi/asm-generic/sembuf.h
index c8c1d29..46306f7 100644
--- a/libc/kernel/uapi/asm-generic/sembuf.h
+++ b/libc/kernel/uapi/asm-generic/sembuf.h
@@ -19,11 +19,12 @@
 #ifndef __ASM_GENERIC_SEMBUF_H
 #define __ASM_GENERIC_SEMBUF_H
 #include <asm/bitsperlong.h>
+#include <asm/ipcbuf.h>
 struct semid64_ds {
   struct ipc64_perm sem_perm;
 #if __BITS_PER_LONG == 64
-  __kernel_time_t sem_otime;
-  __kernel_time_t sem_ctime;
+  long sem_otime;
+  long sem_ctime;
 #else
   unsigned long sem_otime;
   unsigned long sem_otime_high;