framework/rt_config: Remove over cautious error checking.

Previously when validating cpufreq runtime parameters it would check too
early whether the cpu was online, not allowing for the fact that the cpu
might be being onlined before the parameter was committed to the device.

wa/framework/target/runtime_config.py

@@ -516,10 +516,6 @@ class CpufreqRuntimeConfig(RuntimeConfig):
     def validate_parameters(self):
         '''Method to validate parameters against each other'''
         for cpu in self.config:
-            if cpu not in self.target.list_online_cpus():
-                msg = 'Cannot configure frequencies for {} as no CPUs are online.'
-                raise TargetError(msg.format(cpu))
-
             config = self.config[cpu]
             minf = config.get('min_frequency')
             maxf = config.get('max_frequency')