net: stmmac: dwmac-generic: use stmmac_pltfr_init()

Shrink the code in dwmac-generic by using the new stmmac_pltfr_init()
helper.
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Link: https://lore.kernel.org/r/20230623100417.93592-3-brgl@bgdev.plSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/stmicro/stmmac/dwmac-generic.c

@@ -47,11 +47,9 @@ static int dwmac_generic_probe(struct platform_device *pdev)
 	}
 
 	/* Custom initialisation (if needed) */
-	if (plat_dat->init) {
-		ret = plat_dat->init(pdev, plat_dat->bsp_priv);
+	ret = stmmac_pltfr_init(pdev, plat_dat);
 	if (ret)
 		goto err_remove_config_dt;
-	}
 
 	ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
 	if (ret)