seccomp: add arch_prctl syscall for amx

When enabling amx feature, we should call arch_prctl to request
permission to use tile data for guest. The permission should be
requested before the first vcpu is created, so we need to call
arch_prctl in vmm thread. This patch adds the arch_prctl syscall for
vmm_thread_rules.

Fixes: cloud-hypervisor#7516

Signed-off-by: Songqian Li <[email protected]>

Author: lisongqian

vmm/src/seccomp_filters.rs

@@ -550,6 +550,8 @@ fn vmm_thread_rules(
         (libc::SYS_accept4, vec![]),
         #[cfg(target_arch = "x86_64")]
         (libc::SYS_access, vec![]),
+        #[cfg(target_arch = "x86_64")]
+        (libc::SYS_arch_prctl, vec![]),
         (libc::SYS_bind, vec![]),
         (libc::SYS_brk, vec![]),
         (libc::SYS_clock_gettime, vec![]),