ath10k: use names in function definition arguments

Fixes new checkpatch warnings:

drivers/net/wireless/ath/ath10k/htt.h:1823: function definition argument 'struct sk_buff *' should also have an identifier name
drivers/net/wireless/ath/ath10k/wmi.h:6607: function definition argument 'struct wmi_start_scan_arg *' should also have an identifier name

Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>