spi: mtk_spim: add support to use DT live tree

Change devfdt_get_addr_ptr to dev_read_addr_ptr to support DT live tree.

diff --git a/drivers/spi/mtk_spim.c b/drivers/spi/mtk_spim.c
index b66bcfc..cd9b9d3 100644
--- a/drivers/spi/mtk_spim.c
+++ b/drivers/spi/mtk_spim.c
@@ -648,7 +648,7 @@
 	struct mtk_spim_priv *priv = dev_get_priv(dev);
 	int ret;
 
-	priv->base = devfdt_get_addr_ptr(dev);
+	priv->base = dev_read_addr_ptr(dev);
 	if (!priv->base)
 		return -EINVAL;