qcacld-3.0: Fix improper setting of RPS CPU mask
RPS CPU mask is getting set even if feature is not enabled,
due to this RPS config is taking affect and throughput is degraded.
Fix this by checking dynamic RPS enablement before setting RPS CPU mask.
Change-Id: I472a600e665271db7ea1e6fa650d88cba7804ab8
CRs-Fixed: 3258049