target: Make default modules list empty

Default modules are a recurrent source of errors as they fail to
initialize (cgroups particularly) on any recent target. This leads to
error in basically any workload-automation setup on Android 12 and
above targets.

Since modules can now be lazily loaded upon Target attribute access,
there is no reason to preload those anymore.

devlib/target.py

@@ -130,13 +130,7 @@ class Target(object):
     os = None
     system_id = None
 
-    default_modules = [
-        'hotplug',
-        'cpufreq',
-        'cpuidle',
-        'cgroups',
-        'hwmon',
-    ]
+    default_modules = []
 
     @property
     def core_names(self):