wcnss: Add support to read wifi dual band capability

The WLAN dual band support vary from target to target
and to enable/disable dual band support for a particular
target the wcnss platform driver read the wlan hardware
qfuse register and export the dual band capability info
to wlan host driver to enable/disable this dual band feature.

Add export symbol for dual band capability info.

CRs-Fixed: 1115909
Change-Id: I42bee0b80b43fa638f1d418c9fada2fc285df006
Signed-off-by: Anand Kumar <anandkumar@codeaurora.org>
Signed-off-by: Sarada Prasanna Garnayak <sgarna@codeaurora.org>