ARM: s5pv210_defconfig: Enable options needed to boot typical Linux distro

Enable few options which are required to boot typical Linux distro. It
was tested by booting ArchLinux ARM from sdcard.

Signed-off-by: Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>