Rework POWERLINK configuration

Change default value for 

Change default in XML for ENABLE_SOC_JITTTER_TRESHOLD

The value is set in wrong Flag list

is set in 

  /** Stack configuration flags (see EPLCN_IF_CFG_STACK_CFG_FLAGS_*) */
  TLR_UINT32      ulStackCfgFlags;

but must be set in

  /** if the bit MSK_EPLCN_IF_CFG_USE_CUSTOM_TH_* is set, the value of ulThreshold* is used.
   * Otherwise the thresholds are configured with their default values */
  TLR_UINT8       bUseCustomThreshold;