qcacld-3.0: Refactor three WNI and one INI

Based on new cfg framework, refactor below WNI cfg:
 - WNI_CFG_VALID_CHANNEL_LIST
 - WNI_CFG_COUNTRY_CODE
 - WNI_CFG_REMOVE_TIME_SYNC_CMD
 - CFG_REMOVE_TIME_STAMP_SYNC_CMD_NAME

Change-Id: Ic612705ad6c36e055b50baf30ae3e76818f50eed
CRs-Fixed: 2381199
21 files changed