mtd: spi-nor: Get rid of duplicated argument in spi_nor_parse_sfdp()

spi_nor_parse_sfdp(nor, nor->params);
passes for the second argument a member within the first argument.
Drop the second argument and obtain it directly from the first,
and do it across all the children functions. This is a follow up for
'commit 69a8eed5 ("mtd: spi-nor: Don't copy self-pointing struct around")'

Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Reviewed-by: Pratyush Yadav <p.yadav@ti.com>
Link: https://lore.kernel.org/r/20210306095002.22983-4-tudor.ambarus@microchip.com