memory: fsl_ifc: Make FSL_IFC config visible and selectable

While use of fsl_ifc driver with NAND flash is fine, as the fsl_ifc_nand
driver selects FSL_IFC automatically, we need the CONFIG_FSL_IFC option to
be selectable for platforms using fsl_ifc with NOR flash.

Fixes: ea0c0ad6 ("memory: Enable compile testing for most of the drivers")
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Esben Haabendal <esben@geanix.com>
Link: https://lore.kernel.org/r/20240530-fsl-ifc-config-v3-1-1fd2c3d233dd@geanix.com


Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>