ARM: s3c: remove obsolete config S3C64XX_SETUP_IDE

ARM: s3c: remove obsolete config S3C64XX_SETUP_IDE

Commit 0d297df03890 ("ARM: s3c: simplify platform code") removes the line
in Makefile.s3c64xx to configure the inclusion of setup-ide-s3c64xx.c,
with CONFIG_S3C64XX_SETUP_IDE. So, since then, config S3C64XX_SETUP_IDE has
no effect and any further purpose.

Remove the obsolete config S3C64XX_SETUP_IDE.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20230508040433.13648-1-lukas.bulwahn@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>