Update to kernel headers v5.3.2.

Test: Builds and run unit tests on taimen/cuttlefish.
Change-Id: I6ebd8f179d159ac974555e8edca588083e8081b3
diff --git a/libc/kernel/uapi/asm-arm/asm/unistd-common.h b/libc/kernel/uapi/asm-arm/asm/unistd-common.h
index d9e73dc..091bd74 100644
--- a/libc/kernel/uapi/asm-arm/asm/unistd-common.h
+++ b/libc/kernel/uapi/asm-arm/asm/unistd-common.h
@@ -405,4 +405,6 @@
 #define __NR_fsconfig (__NR_SYSCALL_BASE + 431)
 #define __NR_fsmount (__NR_SYSCALL_BASE + 432)
 #define __NR_fspick (__NR_SYSCALL_BASE + 433)
+#define __NR_pidfd_open (__NR_SYSCALL_BASE + 434)
+#define __NR_clone3 (__NR_SYSCALL_BASE + 435)
 #endif