ath10k: sdio: remove _hif_ prefix from functions not part of hif interface

The _hif_ prefix should be used only on functions part of ath10k_hif_ops, so
remove it from functions which should not have it.

No functional changes, compile tested only.

Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/1587037859-28873-4-git-send-email-kvalo@codeaurora.org