ath10k: introduce struct ath10k_skb_rxcb

It doesn't make much sense to share the
ath10k_skb_cb with Rx path. The Rx path doesn't
need to keep any mac80211's data.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

diff --cc drivers/net/wireless/ath/ath10k/core.h
Simple merge

diff --cc drivers/net/wireless/ath/ath10k/htt_rx.c
Simple merge

diff --cc drivers/net/wireless/ath/ath10k/pci.c
Simple merge