qcacld-3.0: revert TDLS pkt statistics changes

TDLS pkts statistics API cost 10% CPU cycle of whole RX
thread. It's optimized in another change from TDLS team to
remove excessive lock/unlock. So original change is not needed.

Change-Id: Ica1dd6bf8a94a4bef6045b07228bd547aeda3a00
CRs-Fixed: 2930306