qcacmn: Add WMI support for peer_extd2 stats

Add the necessary support for peer_extd2 stats in the WMI layer. The
stats contain rx_bytes, rx_err and rx_mpdus

Change-Id: I9f787e28a8e128471489c8f47ac03fef77dae930
CRs-Fixed: 2395636
5 files changed