of: Provide dummy of_device_compatible_match() for compile-testing

Most of_device_*() functions have dummy versions for CONFIG_OF=n,
but of_device_compatible_match() hasn't.  Fix that to improve the
ability to do compile-testing.

Fixes: b9c13fe3 ("dt: Add of_device_compatible_match()")
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NRob Herring <robh@kernel.org>

include/linux/of.h

@@ -627,6 +627,12 @@ static inline int of_device_is_compatible(const struct device_node *device,
 	return 0;
 }
 
+static inline  int of_device_compatible_match(struct device_node *device,
+					      const char *const *compat)
+{
+	return 0;
+}
+
 static inline bool of_device_is_available(const struct device_node *device)
 {
 	return false;