qcacld-3.0: Enable EXTSCAN based on converged extscan component

Enable EXTSCAN based on converged cfg component and remove
legacy codes.

Change-Id: Ia4af89c6a898a936c89c6f3f155609a9c3d98541
CRs-Fixed: 2302197
diff --git a/Kbuild b/Kbuild
index 4447cb9..f5f129d 100644
--- a/Kbuild
+++ b/Kbuild
@@ -618,6 +618,10 @@
 		$(WLAN_COMMON_ROOT)/os_if/linux/wlan_cfg80211.o \
 		$(WLAN_COMMON_ROOT)/target_if/scan/src/target_if_scan.o
 
+ifeq ($(CONFIG_FEATURE_WLAN_EXTSCAN), y)
+UMAC_SCAN_OBJS += $(UMAC_SCAN_DISP_DIR)/wlan_extscan_api.o
+endif
+
 ############# UMAC_SPECTRAL_SCAN ############
 UMAC_SPECTRAL_DIR := spectral
 UMAC_SPECTRAL_DISP_INC_DIR := $(UMAC_SPECTRAL_DIR)/dispatcher/inc