ath10k: fix crash related to printing features

This looks like a regression from commit c4cdf753 ("ath10k: move
fw_features to struct ath10k_fw_file"), we were printing the features from a
wrong struct.

Fixes: c4cdf753

 ("ath10k: move fw_features to struct ath10k_fw_file")
Signed-off-by: Ben Greear <greearb@candelatech.com>
[kvalo@qca.qualcomm.com: improve commit log]
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>