qcacld-3.0: Enable the PRE_CAC_SUPPORT for qca6390 by default

Enable the PRE_CAC_SUPPORT for qca6390 by default to fix the AP start
failure on the DFS channel.

Change-Id: Iacc513c6804c1b51dd6752a74423fb9d5e6a8194
CRs-Fixed: 3353106

configs/qca6390_defconfig

@@ -4,6 +4,8 @@ CONFIG_DIRECT_BUF_RX_ENABLE := y
 CONFIG_WMI_DBR_SUPPORT := y
 CONFIG_TX_AGGREGATION_SIZE_ENABLE := y
 CONFIG_RX_PERFORMANCE := y
+#Flag to enable pre cac feature
+CONFIG_FEATURE_WLAN_PRE_CAC := y
 
 ifeq ($(CONFIG_CNSS_QCA6390), y)
 	ifeq ($(CONFIG_CNSS_EMULATION), y)