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/pch/pch-uclass.c b/drivers/pch/pch-uclass.c
index cae4f50..b33d502 100644
--- a/drivers/pch/pch-uclass.c
+++ b/drivers/pch/pch-uclass.c
@@ -12,15 +12,15 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-int pch_get_sbase(struct udevice *dev, ulong *sbasep)
+int pch_get_spi_base(struct udevice *dev, ulong *sbasep)
 {
 	struct pch_ops *ops = pch_get_ops(dev);
 
 	*sbasep = 0;
-	if (!ops->get_sbase)
+	if (!ops->get_spi_base)
 		return -ENOSYS;
 
-	return ops->get_sbase(dev, sbasep);
+	return ops->get_spi_base(dev, sbasep);
 }
 
 int pch_set_spi_protect(struct udevice *dev, bool protect)