drivers: use devfdt_get_addr_index_ptr when cast to pointer

The fdt_addr_t and phys_addr_t size have been decoupled. A 32bit CPU
can expect 64-bit data from the device tree parser, so use
devfdt_get_addr_index_ptr instead of the devfdt_get_addr_index function
in the various files in the drivers directory that cast to a pointer.
As we are there also streamline the error response to -EINVAL on return.

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/mmc/xenon_sdhci.c b/drivers/mmc/xenon_sdhci.c
index 2f88050..16ac84a 100644
--- a/drivers/mmc/xenon_sdhci.c
+++ b/drivers/mmc/xenon_sdhci.c
@@ -537,7 +537,7 @@
 	host->ioaddr = dev_read_addr_ptr(dev);
 
 	if (device_is_compatible(dev, "marvell,armada-3700-sdhci"))
-		priv->pad_ctrl_reg = (void *)devfdt_get_addr_index(dev, 1);
+		priv->pad_ctrl_reg = devfdt_get_addr_index_ptr(dev, 1);
 
 	name = fdt_getprop(gd->fdt_blob, dev_of_offset(dev), "marvell,pad-type",
 			   NULL);