This patch moves SoC header files for supporting each SoCs to
plat-samsung directory. This is required to make one plat-
directory for Samsung SoCs.

Cc: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: NKukjin Kim <kgene.kim@samsung.com>

This patch adds ARCH_S5P64X0 which can support S5P6440 and S5P6450 with
one kernel image. So moved some files of mach-s5p6440 into the new ARCH
directory mach-s5p64x0.
Signed-off-by: NKukjin Kim <kgene.kim@samsung.com>

This patch adds Samsung's S5P6440 CPU support.
Signed-off-by: NKukjin Kim <kgene.kim@samsung.com>
Signed-off-by: NBen Dooks <ben-linux@fluff.org>