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/stat.h b/libc/kernel/uapi/linux/stat.h
index bf728d0..98fdbea 100644
--- a/libc/kernel/uapi/linux/stat.h
+++ b/libc/kernel/uapi/linux/stat.h
@@ -100,4 +100,5 @@
 #define STATX_ATTR_NODUMP 0x00000040
 #define STATX_ATTR_ENCRYPTED 0x00000800
 #define STATX_ATTR_AUTOMOUNT 0x00001000
+#define STATX_ATTR_VERITY 0x00100000
 #endif