rockchip: sdhci: Fix sdhci mmc driver probe abort

This patch fix mmc driver abort caused by below patch:
3d296365e4 mmc: sdhci: Add support for sdhci-caps-mask

After the patch sdhci_setup_cfg() access to host->mmc->dev,
so we have to do init before make the call to the function()

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/drivers/mmc/rockchip_sdhci.c b/drivers/mmc/rockchip_sdhci.c
index cb623d5..dd3d557 100644
--- a/drivers/mmc/rockchip_sdhci.c
+++ b/drivers/mmc/rockchip_sdhci.c
@@ -68,15 +68,15 @@
 	if (host->bus_width == 8)
 		host->host_caps |= MMC_MODE_8BIT;
 
-	ret = sdhci_setup_cfg(&plat->cfg, host, 0, EMMC_MIN_FREQ);
-
 	host->mmc = &plat->mmc;
-	if (ret)
-		return ret;
 	host->mmc->priv = &prv->host;
 	host->mmc->dev = dev;
 	upriv->mmc = host->mmc;
 
+	ret = sdhci_setup_cfg(&plat->cfg, host, 0, EMMC_MIN_FREQ);
+	if (ret)
+		return ret;
+
 	return sdhci_probe(dev);
 }