Driver core: export platform_device_register_data as a GPL symbol

This allows MFD's to register/bind drivers for their sub devices while
still being compiled as a module.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 9d2ee25..58efaf2 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -441,6 +441,7 @@
 	platform_device_put(pdev);
 	return ERR_PTR(retval);
 }
+EXPORT_SYMBOL_GPL(platform_device_register_data);
 
 static int platform_drv_probe(struct device *_dev)
 {