ath10k: set CTS protection VDEV param only if VDEV is up
The cts protection vdev parameter, in new QCA9377 TF2.0 firmware,
requires bss peer to be created for the STATION vdev type.
bss peer is being allocated by the firmware after vdev_start/_up commands.
mac80211 may call the cts protection setup at any time, so the
we needs to track the situation and defer the cts configuration
to prevent firmware asserts, like below: