qcacld-3.0: Refactor IOCTL get/set APIs

Modify the APIs which handle the IOCTL get/set commands in the driver.
Use link info pointer as function argument. Existing callers moved
to deflink pointer in adapter.

Change-Id: I39aed211a49fde4f21a859e11595af0e8ba399c5
CRs-Fixed: 3521228