As part of the 6GHz band support, there is now more than 2 bands and
hence config_wifi_dual_band_support is misleading.
This commit replaces this config with config_wifi5ghzSupport which is
more reflecting to the device support check.
Bug: 145936758
Bug: 139354972
Test: Builds and Wifi runs successfully.
Change-Id: I6a1a18965b8020049f9b395ae97b6d84e4f5ae94
a342b8f7b3