The vht_center_freq2 parameter was in incorrect order in the call to
wpas_p2p_group_add_persistent(). This would have dropped the value when
adding a group based on a previously created persistent group ion the GO
side and that would have resulted in a failure to start the GO.
Fix the function call to use the correct order for the parameters.
Signed-off-by: Jintao Lin <jintaolin@chromium.org>