cnss: Add support for QCA6180

Add support for QCA6180 module. QCA6180 module requires the host
to build the FW image descriptor table on host memory. And the
target will fetch these FW images once the BMI load command is
received from host.

CRs-Fixed: 732760
Change-Id: I53920c1c3881c1119fead684bbafae20e2470f1c
Signed-off-by: Sameer Thalappil <sameert@codeaurora.org>