kata-ctl: Allow empty const

Due to the way that multi-arch support is done, on various platforms
we will get a clippy error:
```
error: this expression always evaluates to false
```
which might not be true on those other platforms, so
allow this code pattern to suppress the clippy error

Signed-off-by: stevenhorsman <steven@uk.ibm.com>

src/tools/kata-ctl/src/utils.rs

@@ -111,6 +111,7 @@ pub fn get_distro_details(os_release: &str, os_release_clr: &str) -> Result<(Str
     target_arch = "aarch64",
     all(target_arch = "powerpc64", target_endian = "little"),
 ))]
+#[allow(clippy::const_is_empty)]
 pub fn get_generic_cpu_details(cpu_info_file: &str) -> Result<(String, String)> {
     let cpu_info = kata_sys_util::cpu::get_single_cpu_info(cpu_info_file, "\n\n")?;
     let lines = cpu_info.lines();