mtd: rawnand: rockchip: drop unused module alias

The driver has never supported anything but OF probing so drop the
unused platform module alias.

Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>

Author: jhovold

drivers/mtd/nand/raw/rockchip-nand-controller.c

@@ -1505,4 +1505,3 @@ module_platform_driver(rk_nfc_driver);
 MODULE_LICENSE("Dual MIT/GPL");
 MODULE_AUTHOR("Yifeng Zhao <yifeng.zhao@rock-chips.com>");
 MODULE_DESCRIPTION("Rockchip Nand Flash Controller Driver");
-MODULE_ALIAS("platform:rockchip-nand-controller");