qcacld-3.0: Enable 6GHz Band capability for WCN6750

Enable 6GHz Band capability flag in host driver for WCN6750.

Change-Id: Id17e64a283aeee6c09491c13a0a3aa5cb7d4f6bf

configs/default_defconfig

@@ -1053,6 +1053,11 @@ ifeq (y,$(findstring y,$(CONFIG_ARCH_MSM) $(CONFIG_ARCH_QCOM)))
 CONFIG_WLAN_FEATURE_DP_BUS_BANDWIDTH := y
 endif
 
+ifeq ($(CONFIG_CNSS_QCA6750), y)
+#Enable 6 GHz Band
+CONFIG_BAND_6GHZ := y
+endif
+
 ifeq ($(CONFIG_CNSS_QCA6490), y)
 
 #Enable 6 GHz Band