arm: samsung: Move CONFIG_MISC_COMMON to Kconfig

This option controls using board/samsung/common/misc.c, so add a Kconfig
file there as well and select it from the boards which use this
functionality.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Minkyu Kang <mk7.kang@samsung.com>