qcacld-3.0: Remove obsolete struct hdd_context_s reference

In CDS there is a forward reference to struct hdd_context_s, However
this forward reference is not used, and in fact that struct name is no
longer in use in the driver, so remove it.

Change-Id: Iecf43870b22143f656bb9b8e413ae46c2f59bab4
CRs-Fixed: 2362713

core/cds/inc/cds_sched.h

@@ -167,8 +167,6 @@ struct cds_log_complete {
 	bool recovery_needed;
 };
 
-/* forward-declare hdd_context_s as it is used ina function type */
-struct hdd_context_s;
 struct cds_context {
 	/* Scheduler Context */
 	cds_sched_context qdf_sched;