fix missing asm macro

src/libboard_artiq/src/fiq.rs

@@ -1,6 +1,7 @@
 use libboard_zynq::{println, stdio};
 use libcortex_a9::{interrupt_handler, regs::MPIDR};
 use libregister::RegisterR;
+use core::arch::asm;
 
 #[cfg(has_si549)]
 use crate::si549;

src/libksupport/src/irq.rs

@@ -3,6 +3,7 @@ use core::sync::atomic::{AtomicBool, Ordering};
 use libboard_zynq::{gic, mpcore, println, stdio};
 use libcortex_a9::{asm, interrupt_handler, notify_spin_lock, regs::MPIDR, spin_lock_yield};
 use libregister::RegisterR;
+use core::arch::asm;
 
 extern "C" {
     static mut __stack1_start: u32;