mmc: dw_mmc: Use device_property_string_array_count()

Use device_property_string_array_count() to get number of strings
in a string array property.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20220202182450.54925-1-andriy.shevchenko@linux.intel.comSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/dw_mmc.c

@@ -3057,8 +3057,7 @@ static void dw_mci_init_dma(struct dw_mci *host)
 		dev_info(host->dev, "Using internal DMA controller.\n");
 	} else {
 		/* TRANS_MODE_EDMAC: check dma bindings again */
-		if ((device_property_read_string_array(dev, "dma-names",
-						       NULL, 0) < 0) ||
+		if ((device_property_string_array_count(dev, "dma-names") < 0) ||
 		    !device_property_present(dev, "dmas")) {
 			goto no_dma;
 		}