qcacmn: Initialize ppe related function pointer to null

Initialize ppe related function pointers to null for 5332 and add a
check before calling the function pointer.

Change-Id: Idcaecfa839ff6822ab385053405256c201579bda
CRs-Fixed: 3378893

hal/wifi3.0/qca5332/hal_5332.c

@@ -1354,6 +1354,7 @@ static void hal_hw_txrx_ops_attach_qca5332(struct hal_soc *hal_soc)
 	hal_soc->ops->hal_tx_dump_ppe_vp_entry = NULL;
 	hal_soc->ops->hal_tx_get_num_ppe_vp_tbl_entries = NULL;
 	hal_soc->ops->hal_tx_enable_pri2tid_map = NULL;
+	hal_soc->ops->hal_ppeds_cfg_ast_override_map_reg = NULL;
 	hal_soc->ops->hal_tx_config_rbm_mapping_be =
 				hal_tx_config_rbm_mapping_be_5332;