dm: pch: Rename get_sbase op to get_spi_base

Spell out 'sbase' to 'spi_base' so that it looks clearer.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/spi/ich.c b/drivers/spi/ich.c
index 1acdc88..00b2fed 100644
--- a/drivers/spi/ich.c
+++ b/drivers/spi/ich.c
@@ -119,7 +119,7 @@
 	void *sbase;
 
 	/* SBASE is similar */
-	pch_get_sbase(dev->parent, &sbase_addr);
+	pch_get_spi_base(dev->parent, &sbase_addr);
 	sbase = (void *)sbase_addr;
 	debug("%s: sbase=%p\n", __func__, sbase);