cnss: Add support for creating board data file image table

Add support for creating board data file image table for module
QCA6180. QCA6180 module requires the host to build the board data
image descriptor table on host memory. And the target will fetch
board data file once the BMI load command is received from host.

CRs-Fixed: 738427
Change-Id: I3efa035ee2f125cc8009106b808f2dfc0e33ba97
Signed-off-by: Yuanyuan Liu <yuanliu@codeaurora.org>