mtd: spi-nor: Fix a trivial typo

Fix a trivial typo in one of the core's comments.

Fixes: 620df249 ("mtd: spi-nor: Introduce spi_nor_get_flash_info()")
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20230331194726.840208-1-miquel.raynal@bootlin.com


Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org>