qcacld-3.0: Support for HTT Stats

1. Remove unused variable of type ol_txrx_stats_req
   passed through cdp_txrx_stats api to avoid
   compilation break.
2. Add dp_stats file to the Kbuild. This file is
   used to collect HTT Statistics for Lithium based
   chipsets.

Change-Id: I0252c996d47cc866291d25f35eb9bb9e19073a8b
CRs-Fixed: 2050798
diff --git a/Kbuild b/Kbuild
index eb2dd10..da2587e 100644
--- a/Kbuild
+++ b/Kbuild
@@ -1052,7 +1052,8 @@
 		$(DP_SRC)/dp_reo.o \
 		$(DP_SRC)/dp_rx_mon_dest.o \
 		$(DP_SRC)/dp_rx_mon_status.o \
-		$(DP_SRC)/dp_rx_defrag.o
+		$(DP_SRC)/dp_rx_defrag.o \
+		$(DP_SRC)/dp_stats.o
 endif
 
 ############ CFG ############