ath10k: fix vdev map size for 10.x firmware

Firmware 10.x supports up to 8 virtual AP interfaces
(comparing to 7 for main firmware). Previous vdev map
initialization was missing enough space for 8 + 1 vdevs
(we may spent one for mac monitor), due to wrong define used.

Use correct one - TARGET_10X_NUM_VDEVS - for 10.x firmware.

Signed-off-by: Bartosz Markowski <bartosz.markowski@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>