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/linux/utime.h b/libc/kernel/uapi/linux/utime.h
index 937e7c3..8ed98b9 100644
--- a/libc/kernel/uapi/linux/utime.h
+++ b/libc/kernel/uapi/linux/utime.h
@@ -20,7 +20,7 @@
 #define _LINUX_UTIME_H
 #include <linux/types.h>
 struct utimbuf {
-  __kernel_time_t actime;
-  __kernel_time_t modtime;
+  __kernel_old_time_t actime;
+  __kernel_old_time_t modtime;
 };
 #endif