ARM: remove obsolete plat-s5pc1xx directory

This patch removes all obsolete files from plat-s5pc1xx. This directory is
no longer needed. S5PC100 SoC is now completely supported in plat-s5p
framework.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>