qcacld-3.0: Report correct max NSS in case of DBS

Currently in the driver, the NSS reported to the userspace in case of
max rate reporting doesn't take into account if the hardware mode is DBS
or not. This causes the NSS to remain 2 even if the connection has
changed to 1x1.

Add a check if the current mode is DBS or not and update the NSS
accordingly.

Change-Id: I66ea830c7c6483c7ce957e1276b4ac5a535b17df
CRs-Fixed: 2579182
1 file changed