ath10k: Fix the invalid tx/rx chainmask configuration

The driver is allowing the invalid tx/rx chainmask configuration
(other than 1,3,7,15) set by the user. It causes the firmware
crash due to the invalid chainmask values.

Hence, reject the invalid chainmask values in the driver by not
sending the pdev set command to the firmware.

Tested hardware: QCA9888
Tested firmware: 10.4-3.10-00047

Signed-off-by: Maharaja Kennadyrajan <mkenna@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/1587495512-29813-1-git-send-email-mkenna@codeaurora.org