qcacld-3.0: Enable COEX feature flag

Dedicated Bluetooth Antenna Mode (DBAM) feature is dependent
on COEX feature. So, enable CONFIG_FETURE_COEX in kiwi_v2
default config.

Change-Id: I1a2001f7be88d7527de5402d5272799b207a0077
CRs-Fixed: 3251103

configs/kiwi_v2_defconfig

@@ -27,6 +27,9 @@ CONFIG_GET_DRIVER_MODE := y
 
 CONFIG_QCA_SUPPORT_TX_MIN_RATES_FOR_SPECIAL_FRAMES := y
 
+#Enable COEX feature
+CONFIG_FEATURE_COEX := y
+
 #Enable DBAM feature
 ifeq ($(CONFIG_FEATURE_COEX), y)
 CONFIG_WLAN_FEATURE_COEX_DBAM := y