Update util.py

Removed the unused is_arm function

linux_voice_assistant/util.py

@@ -1,22 +1,17 @@
 """Utility methods."""
 
-import platform
 import uuid
 from collections.abc import Callable
 from typing import Optional
 
 
 def get_mac() -> str:
-    mac = uuid.getnode()
-    mac_str = ":".join(f"{(mac >> i) & 0xff:02x}" for i in range(40, -1, -8))
-    return mac_str
+    """Get MAC address as a string."""
+    return ":".join(
+        f"{((uuid.getnode() >> i) & 0xFF):02x}" for i in range(0, 8 * 6, 8)
+    )[::-1]
 
 
 def call_all(*callables: Optional[Callable[[], None]]) -> None:
     for item in filter(None, callables):
         item()
-
-
-def is_arm() -> bool:
-    machine = platform.machine()
-    return ("arm" in machine) or ("aarch" in machine)