mtd: rawnand: rockchip: Add missing title to a kernel doc comment

All fields of the nfc_cfg structure are documented but the name, which
leads to a W=1 warning. Add a title.

Fixes: 058e0e8 ("mtd: rawnand: rockchip: NFC driver for RK3308, RK2928 and others")
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20231211150704.109138-2-miquel.raynal@bootlin.com

Author: miquelraynal

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

@@ -108,6 +108,7 @@ struct rk_ecc_cnt_status {
 };
 
 /**
+ * struct nfc_cfg: Rockchip NAND controller configuration
  * @type: NFC version
  * @ecc_strengths: ECC strengths
  * @ecc_cfgs: ECC config values