of: use correct function prototype for of_overlay_fdt_apply()

When CONFIG_OF_OVERLAY is not enabled the fallback stub for
of_overlay_fdt_apply() does not match the prototype for the case when
CONFIG_OF_OVERLAY is enabled. Update the stub to use the correct
function prototype.

Fixes: 39a751a4 ("of: change overlay apply input data from unflattened to FDT")
Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Reviewed-by: Frank Rowand <frank.rowand@sony.com>
Signed-off-by: Rob Herring <robh@kernel.org>

include/linux/of.h

@@ -1449,7 +1449,8 @@ int of_overlay_notifier_unregister(struct notifier_block *nb);
 
 #else
 
-static inline int of_overlay_fdt_apply(void *overlay_fdt, int *ovcs_id)
+static inline int of_overlay_fdt_apply(void *overlay_fdt, u32 overlay_fdt_size,
+				       int *ovcs_id)
 {
 	return -ENOTSUPP;
 }