mmc: hi6220_dw_mmc: add compatible for Poplar support

It adds compatible "hisilicon,hi3798cv200-dw-mshc" for Poplar SoC
Hi3798CV200 to probe this mmc driver.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
diff --git a/drivers/mmc/hi6220_dw_mmc.c b/drivers/mmc/hi6220_dw_mmc.c
index cc58aff..effd1e4 100644
--- a/drivers/mmc/hi6220_dw_mmc.c
+++ b/drivers/mmc/hi6220_dw_mmc.c
@@ -77,6 +77,7 @@
 
 static const struct udevice_id hi6220_dwmmc_ids[] = {
 	{ .compatible = "hisilicon,hi6220-dw-mshc" },
+	{ .compatible = "hisilicon,hi3798cv200-dw-mshc" },
 	{ }
 };