mtd: au1550nd: add missing platform_set_drvdata()

Add missing platform_set_drvdata() in au1550nd_probe(), otherwise
calling platform_get_drvdata() in remove returns NULL.

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
diff --git a/drivers/mtd/nand/au1550nd.c b/drivers/mtd/nand/au1550nd.c
index ae8dd7c..909b673 100644
--- a/drivers/mtd/nand/au1550nd.c
+++ b/drivers/mtd/nand/au1550nd.c
@@ -480,6 +480,8 @@
 
 	mtd_device_register(&ctx->info, pd->parts, pd->num_parts);
 
+	platform_set_drvdata(pdev, ctx);
+
 	return 0;
 
 out3: