qcacmn: Add callback to get WBM internal error in qca6750

Add target specific callback to read the WBM internal error
for qca6750.

Change-Id: I79960a972d024ead33903415b4094561a22ad99b
CRs-Fixed: 2607116

hal/wifi3.0/qca6750/hal_6750.c

@@ -1317,6 +1317,7 @@ struct hal_hw_txrx_ops qca6750_hal_hw_txrx_ops = {
 	hal_tx_desc_set_cache_set_num_generic,
 	hal_tx_comp_get_status_generic,
 	hal_tx_comp_get_release_reason_generic,
+	hal_get_wbm_internal_error_generic,
 	hal_tx_desc_set_mesh_en_6750,
 
 	/* rx */