qcacld-3.0: Remove the compilation of dfs_cac.c from MCC

dfs_cac.c is moved to WIN specific project. Remove the
corresponding compilation from qcacld-3.0 project.

Change-Id: I036a12b072e65c75a0dcf2d6270027814af1a128
CRs-Fixed: 2843628

Kbuild

@@ -624,7 +624,6 @@ DFS_INC :=	-I$(WLAN_ROOT)/$(DFS_DISP_INC_DIR) \
 		-I$(WLAN_ROOT)/$(DFS_CMN_SERVICES_INC_DIR)
 
 DFS_OBJS :=	$(DFS_CORE_SRC_DIR)/misc/dfs.o \
-		$(DFS_CORE_SRC_DIR)/misc/dfs_cac.o \
 		$(DFS_CORE_SRC_DIR)/misc/dfs_nol.o \
 		$(DFS_CORE_SRC_DIR)/misc/dfs_random_chan_sel.o \
 		$(DFS_CORE_SRC_DIR)/misc/dfs_process_radar_found_ind.o \