drivers/platform: Convert non-modular pdev_bus to use builtin_platform_driver

This driver is configured with a Kconfig option that is
declared as a bool. Hence it is not possible for the code
to be built as modular. However the code is currently using
the module_platform_driver() macro for driver registration.

While this currently works, we really don't want to be including
the module.h header in non-modular code, which we'll be forced
to do, pending some upcoming code relocation from init.h into
module.h. So we fix it now by using the non-modular equivalent.
And since we've already established that the code is non-modular,
we can completely drop any code relating to module_exit.

Signed-off-by: Paul Gortmaker <[e-mail]>

drivers/platform/goldfish/pdev_bus.c

···
 	return ret;
 }
 
-static int goldfish_pdev_bus_remove(struct platform_device *pdev)
-{
-	iounmap(pdev_bus_base);
-	free_irq(pdev_bus_irq, pdev);
-	release_mem_region(pdev_bus_addr, pdev_bus_len);
-	return 0;
-}
-
 static struct platform_driver goldfish_pdev_bus_driver = {
 	.probe = goldfish_pdev_bus_probe,
-	.remove = goldfish_pdev_bus_remove,
 	.driver = {
 		.name = "goldfish_pdev_bus"
 	}
 };
-
-module_platform_driver(goldfish_pdev_bus_driver);
+builtin_platform_driver(goldfish_pdev_bus_driver);