serial: 8250_fsl: Move fsl8250_data to ACPI section

The fsl8250_data structure is only used by ACPI support.
Hence move its definition to the driver's ACPI section.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/e406730a5eab880448d6bb55fbce492d281034ef.1631710623.git.geert+renesas@glider.be


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>