Import the asm macro in std_detect

Fixes #1289

Author: lu-zero

crates/std_detect/src/detect/os/aarch64.rs

@@ -16,6 +16,7 @@
 //! - [Zircon implementation](https://fuchsia.googlesource.com/zircon/+/master/kernel/arch/arm64/feature.cpp)
 //! - [Linux documentation](https://www.kernel.org/doc/Documentation/arm64/cpu-feature-registers.txt)
 
+use crate::arch::asm;
 use crate::detect::{cache, Feature};
 
 /// Try to read the features from the system registers.