wil6210: add support for Talyn-MB boot flow

Talyn-MB introduces various of FW download options:
FW download via PCIe, SPI or PBL for secured access.
The boot and FW download path is determined based on the
OTP HW register. Driver reads this register as part of the
SW reset flow and performs the appropriate initialization
sequence.

Signed-off-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>