qcacmn: Cleanup statistics

1. Move statistics API's to dp_stats.c
2. Move DP_TRACE_STATS to DP_PRINT_STATS
   as it is implemented based on target.

Change-Id: I62f3076a51ca35f0e12cdb0ff0230ea87c2baaf7
CRs-Fixed: 2453443
5 files changed