qcacld-3.0: Remove umac_ota_ack_cb[] from t_wma_handle

Change I414269abb5a5c616cc890dab450a7782e6829d0e ("qcacld-3.0:
Management MGMT TXRX component over HTT") removed all usage of the
legacy umac_ota_ack_cb[] array in t_wma_handle. However it left behind
the actual unused array, so remove it.

Change-Id: Ia909360edefeb413025e8d437199a3f21c808030
CRs-Fixed: 2378329

core/wma/inc/wma.h

@@ -1123,8 +1123,6 @@ typedef struct {
 	wma_tx_dwnld_comp_callback tx_frm_download_comp_cb;
 	qdf_event_t tx_frm_download_comp_event;
 	qdf_event_t tx_queue_empty_event;
-	wma_tx_ota_comp_callback
-				umac_ota_ack_cb[SIR_MAC_MGMT_RESERVED15];
 	wma_tx_ota_comp_callback umac_data_ota_ack_cb;
 	unsigned long last_umac_data_ota_timestamp;
 	qdf_nbuf_t last_umac_data_nbuf;