Currently peer_extd_stats is present in peer_cp_stats structure
which is shared between WIN and MCL and only common features
should be part of this structure as peer_cp_stats is an
abstraction structure for WIN and MCL for cp stats component.
Since peer_extd_stats is MCL specific structure, this should be
moved to peer_mc_cp_stats which is MCL specific feature for
cp stats component.
Change-Id: I18c30db36d34dd3fb3e4f8ad2d3c553c4648548b
CRs-fixed: 2427126
788ab15578