[WCNCR00152247] softap: add dfs test cmd

[Description]
Add dfs test cmd show_dfs_state
Add dfs test cmd show_dfs_radar_param
Add dfs test cmd show_dfs_help
Add dfs test cmd show_dfs_time

Change-Id: I5aec2e5227566acb799d6aa91a299ee265eade4a
Feature: softap
Signed-off-by: Chun Lee <chun.lee@mediatek.com>
CR-Id: WCNCR00152247
7 files changed