qcacmn: Get rid of spinlock lro_unloading_lock

Spinlock "lro_unloading_lock" was required to synchronize the LRO
instance being deleted when there is LRO packet inflight.
With LRO moved to qdf and LRO is tied to hif_napi, LRO instance is
active with life time of the driver. So no need to protect via lock.

Change-Id: I06f7b43e80ddf0ce5e096351b38ce954eb634a95
CRs-Fixed: 2028318

hif/inc/hif.h

@@ -228,7 +228,6 @@ struct qca_napi_info {
 	/* will only be present for data rx CE's */
 	void (*lro_flush_cb)(void *);
 	qdf_lro_ctx_t        lro_ctx;
-	qdf_spinlock_t lro_unloading_lock;
 };
 
 enum qca_napi_tput_state {