wcnss: Add support for nv bin download at coldboot

NV bin is downloaded when wlan driver is loaded. This change
adds support for NV bin download during coldboot of WCNSS and
thus much before wlan driver is loaded. NV bin id not downloaded
by platform driver during SSR.

Change-Id: I070aae4270c54a3af4d4c0a24897e8c0c9cbfaa5
Acked-by: Rajesh Chauhan <rajeshc@qca.qualcomm.com>
Signed-off-by: Sameer Thalappil <sameert@codeaurora.org>