driver core: Provide stubs for !IOMEM builds

The various _ioremap_resource functions are not built when
CONFIG_HAS_IOMEM is disabled but no stubs are provided. Given how
widespread IOMEM usage is in drivers and how rare !IOMEM configurations
are in practical use let's just provide some stubs so users will build
without having to add explicit dependencies on HAS_IOMEM.

The most likely use case is builds with UML for KUnit testing.
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: David Gow <davidgow@google.com>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230718-asoc-topology-kunit-enable-v2-1-0ee11e662b92@kernel.orgSigned-off-by: Mark Brown <broonie@kernel.org>

include/linux/device.h

@@ -349,6 +349,7 @@ unsigned long devm_get_free_pages(struct device *dev,
 				  gfp_t gfp_mask, unsigned int order);
 void devm_free_pages(struct device *dev, unsigned long addr);
 
+#ifdef CONFIG_HAS_IOMEM
 void __iomem *devm_ioremap_resource(struct device *dev,
 				    const struct resource *res);
 void __iomem *devm_ioremap_resource_wc(struct device *dev,
@@ -357,6 +358,31 @@ void __iomem *devm_ioremap_resource_wc(struct device *dev,
 void __iomem *devm_of_iomap(struct device *dev,
 			    struct device_node *node, int index,
 			    resource_size_t *size);
+#else
+
+static inline
+void __iomem *devm_ioremap_resource(struct device *dev,
+				    const struct resource *res)
+{
+	return ERR_PTR(-EINVAL);
+}
+
+static inline
+void __iomem *devm_ioremap_resource_wc(struct device *dev,
+				       const struct resource *res)
+{
+	return ERR_PTR(-EINVAL);
+}
+
+static inline
+void __iomem *devm_of_iomap(struct device *dev,
+			    struct device_node *node, int index,
+			    resource_size_t *size)
+{
+	return ERR_PTR(-EINVAL);
+}
+
+#endif
 
 /* allows to add/remove a custom action to devres stack */
 void devm_remove_action(struct device *dev, void (*action)(void *), void *data);