mtd: rawnand: Give the possibility to verify a read operation is supported

This can be used to discriminate between two path in the parameter
page detection: use data_in cycles (like before) if supported, use the
CHANGE READ COLUMN command otherwise.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://lore.kernel.org/linux-mtd/20200507105241.14299-9-miquel.raynal@bootlin.com