[RFC] cleanup mach-s5p*

[Kukjin Kim]

Hi all,

I have a plan to remove supporting following SoCs in mainline in the near
future.
- s5pc100 - smdkc100
- s5pv210(s5c110) - aquial, goni, smdkc110, smdkv210, torbreck
- s5p64x0(s5p6440, s5p6450)- smdk6440, smdk6450

I think users don't seem to use that any more with mainline. If so, we are
able to consider, it is not right now though.

How do you think?

- Kukjin