misc: Remove manual implementation of is_power_of_two

As clippy of rust-toolchain version 1.83.0-beta.1 suggests, remove
manual implementation of `is_power_of_two` to improve readability.

Signed-off-by: Ruoqing He <heruoqing@iscas.ac.cn>

vm-virtio/src/queue.rs

@@ -178,7 +178,7 @@ pub mod testing {
         // We try to make sure things are aligned properly :-s
         pub fn new(start: GuestAddress, mem: &'a GuestMemoryMmap, qsize: u16) -> Self {
             // power of 2?
-            assert!(qsize > 0 && qsize & (qsize - 1) == 0);
+            assert!(qsize.is_power_of_two());
 
             let mut dtable = Vec::with_capacity(qsize as usize);