mtd: rawnand: hynix: remove @nand_technology kernel-doc description

Remove the extraneous kernel-doc description for @nand_technology to
eliminate a kernel-doc warning:

nand_hynix.c:39: warning: Excess struct member 'nand_technology' description in 'hynix_nand'

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Vignesh Raghavendra <vigneshr@ti.com>
Cc: linux-mtd@lists.infradead.org
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20240224014639.16145-1-rdunlap@infradead.org