vmm: Enable pty console on AArch64

Allowed syscall "SYS_readlinkat" on AArch64 which is required by pty.

Signed-off-by: Michael Zhao <michael.zhao@arm.com>

vmm/src/seccomp_filters.rs

@@ -359,6 +359,8 @@ fn vmm_thread_rules() -> Result<Vec<SyscallRuleSet>, Error> {
         allow_syscall(libc::SYS_readv),
         #[cfg(target_arch = "x86_64")]
         allow_syscall(libc::SYS_readlink),
+        #[cfg(target_arch = "aarch64")]
+        allow_syscall(libc::SYS_readlinkat),
         allow_syscall(libc::SYS_recvfrom),
         allow_syscall(libc::SYS_recvmsg),
         allow_syscall(libc::SYS_restart_syscall),