ARM: SAMSUNG: Add helper to clone and set platform data

This is intended to replace a number of sites in the Samsung kernel
where the same thing is being repeated in specific platform setting
code. See next patches for replacements.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
[kgene.kim@samsung.com: This is for building test]
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>