watchdog: orion_wdt: support SPL usage

When run from the SPL the mvebu targets are using the hardware default
offset for the SoC peripherals. devfdt_get_addr_size_index() understands
how to deal with this via dm_get_translation_offset() so use this
instead of fdtdec_get_addr_size_auto_noparent().

Signed-off-by: Chris Packham <judge.packham@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/drivers/watchdog/orion_wdt.c b/drivers/watchdog/orion_wdt.c
index a0df02d..c1add3e 100644
--- a/drivers/watchdog/orion_wdt.c
+++ b/drivers/watchdog/orion_wdt.c
@@ -114,9 +114,7 @@
 	fdt_addr_t addr;
 	fdt_size_t off;
 
-	addr = fdtdec_get_addr_size_auto_noparent(
-		gd->fdt_blob, dev_of_offset(dev), "reg", index, &off, true);
-
+	addr = devfdt_get_addr_size_index(dev, index, &off);
 	if (addr == FDT_ADDR_T_NONE)
 		return false;