At present, DP_STATS_XXX and DP_HIST_XXX can be disabled or enabled at the same time using macro DISABLE_DP_STATS. Make DP_STATS_XXX and DP_HIST_XXX under different macro so that both can be enabled/disabled separately. HIST_STATS are by default disabled and can be enabled by enabling ENABLE_DP_HIST_STATS macro. Change-Id: I4e7b817afef040407a496e268f2fd680791fc47b CRs-fixed: 2449710