mfd: core: Improve compile coverage of mfd_match_of_node_to_dev()

As of commit c7fe3bb ('mfd: core: Use of_property_read_reg() to
parse "reg"'), all code in mfd_match_of_node_to_dev() compiles fine when
CONFIG_OF is disabled.  As the sole caller of this function is
protected by IS_ENABLED(CONFIG_OF), the #ifdef inside the function can
be removed to increase build coverage, without impacting code size.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/7b9a4a355c5da3fe812ead663285d05b64b84857.1764320964.git.geert+renesas@glider.be
Signed-off-by: Lee Jones <lee@kernel.org>

Author: geertu

drivers/mfd/mfd-core.c

@@ -100,7 +100,6 @@ static int mfd_match_of_node_to_dev(struct platform_device *pdev,
 				    struct device_node *np,
 				    const struct mfd_cell *cell)
 {
-#if IS_ENABLED(CONFIG_OF)
 	struct mfd_of_node_entry *of_entry;
 	u64 of_node_addr;
 
@@ -133,7 +132,6 @@ static int mfd_match_of_node_to_dev(struct platform_device *pdev,
 
 	of_node_get(np);
 	device_set_node(&pdev->dev, of_fwnode_handle(np));
-#endif
 	return 0;
 }