ath10k: Block radar events when requested

This patch ensures that reporting of a radar in simulation
is not done when detection is disabled explicitly by
using the debugfs knob 'dfs_block_radar_events'.

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>