mtd: spinand: gigadevice: add support for GD5F1GQ5RExxG

This chip is the 1.8v version of GD5F1GQ5UExxG.

Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20220320100001.247905-4-gch981213@gmail.com