of: property: Disable fw_devlink DT support for X86

Andre reported fw_devlink=on breaking OLPC XO-1.5 [1].

OLPC XO-1.5 is an X86 system that uses a mix of ACPI and OF to populate
devices. The root cause seems to be ISA devices not setting their fwnode
field. But trying to figure out how to fix that doesn't seem worth the
trouble because the OLPC devicetree is very sparse/limited and fw_devlink
only adds the links causing this issue. Considering that there aren't many
users of OF in an X86 system, simply fw_devlink DT support for X86.

[1] - https://lore.kernel.org/lkml/[email protected]/

Fixes: ea718c6 ("Revert "Revert "driver core: Set fw_devlink=on by default""")
Signed-off-by: Saravana Kannan <[email protected]>
Cc: Andre Muller <[email protected]>
Acked-by: Greg Kroah-Hartman <[email protected]>
Tested-by: Andre Müller <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Rob Herring <[email protected]>

Author: Saravana Kannan

drivers/of/property.c

@@ -1444,6 +1444,9 @@ static int of_fwnode_add_links(struct fwnode_handle *fwnode)
 	struct property *p;
 	struct device_node *con_np = to_of_node(fwnode);
 
+	if (IS_ENABLED(CONFIG_X86))
+		return 0;
+
 	if (!con_np)
 		return -EINVAL;