qcacld-3.0: Add INI to disable 6ghz support for oem

6Ghz channels information is not used by legacy OEM apps example
"lowi-server" having no support for 6Ghz channels.

Hence "oem_6g_support_disable" INI is added. By default INI value is
1. 6Ghz supported OEM applications sets INI value to 0 and gets 6Ghz
channel information from driver.

Change-Id: I2650e6ad2976b64e46ab0143b2bafc2df2343e94
CRs-Fixed: 2597651
6 files changed