arm: mmp: move pxa168 clock definition to separated file

move pxa168 clock definition to another file. Then pxa168 can
choose common clock framework or private clock framework.

Signed-off-by: Chao Xie <xiechao.mail@gmail.com>
Signed-off-by: Haojian Zhuang <haojian.zhuang@gmail.com>
4 files changed