qcacld-3.0: Remove CDS_GET_HAL_CB
Change "qcacld-3.0: Introduce sap_get_mac_context()" introduced a new
API for retrieving the MAC context. Since all instances of using
CDS_GET_HAL_CB have been converted, remove the macro.
Change-Id: Ib0ed67cf6af779d2805c3f7bb0cf3667c5d844f9
CRs-Fixed: 2346185