Add the initial header files for the S3C64XX support to satisfy the
minimal requirements to build a kernel. Some definitions will therefore
be placeholders or empty functions that will ensure that the system can
build and have base functionality. These will be filled in at a later
date.
Signed-off-by: NBen Dooks <ben-linux@fluff.org>

Add the initial PLAT_S3C64XX support files
and directory structure.
Signed-off-by: NBen Dooks <ben-linux@fluff.org>