drivers/net/wireless/ath: ath11k wmi restore mgmt_rx_event_params.chan_freq

Fixes bad merge conflict fix in,

d14eb0ba

Add chan_freq member of structure needed by, see,

f3ccc878

Removed in,

5189a1da

Signed-off-by: Aníbal Limón <anibal.limon@linaro.org>