Current design supports only AHB interface for
11ax chipset. Refactor the code by adding hif layer
for bus level abstraction to support  PCI based device.
Signed-off-by: Govind Singh <govinds@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200506094400.4740-2-govinds@codeaurora.org