mtd/spi-nor: enable USE_CLSR capability for Cypress FL-L product family

In Cypress FL-L product family, P_ERR or E_ERR bits are shifted to SR2V,
and are actually being used. Which means we need cope this special
condition accordingly.

Signed-off-by: Yaliang Wang <Yaliang.Wang@windriver.com>
[RQ: adjust code structure to fit kernel v5.15.]
Signed-off-by: Ruiqiang Hao <Ruiqiang.Hao@windriver.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>