linuxkpi: advance platform_device

These are required by some linux driver like:
https://github.com/beckhoff/bbapi

Reviewed by:		manu
MFC after:		1 week
Sponsored by:		Beckhoff Automation GmbH & Co. KG
Differential Revision:	https://reviews.freebsd.org/D39554

sys/compat/linuxkpi/common/include/linux/platform_device.h

@@ -34,6 +34,9 @@
 #include <linux/device.h>
 
 struct platform_device {
+	const char			*name;
+	int				id;
+	bool				id_auto;
 	struct device			dev;
 };
 
@@ -78,6 +81,13 @@ platform_driver_unregister(struct platform_driver *pdrv)
 	return;
 }
 
+static __inline int
+platform_device_register(struct platform_device *pdev)
+{
+	pr_debug("%s: TODO\n", __func__);
+	return (0);
+}
+
 static __inline void
 platform_device_unregister(struct platform_device *pdev)
 {