Revert "tty: serial: samsung_tty: build it for any platform"

Revert "tty: serial: samsung_tty: build it for any platform"

This reverts commit d04e368f73faab2421de7fccd0773a3242f8779e.

When the user configures a kernel without support for Samsung SoCs, it
makes no sense to ask the user about enabling "Samsung SoC serial
support", as Samsung serial ports can only be found on Samsung SoCs.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20200306102301.16870-1-geert+renesas@glider.be
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>