[COMMON] soc: samsung: add exynos chipid driver support

[COMMON] soc: samsung: add exynos chipid driver support

Exynos SoCs have Chipid, for identification of product IDs
and SoC revisions. This patch intendes to provide initialization
code for all these functionalites.

This driver usese existing binding for exnos-chipid.

CC: Grant Likely <grant.likely@linaro.org>
CC: Rob Herring <robh+dt@kernel.org>
CC: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Pankaj Dubey <pankaj.dubey@samsung.com>
Signed-off-by: Hosung Kim <hosung0.kim@samsung.com>
Conflicts:

	drivers/soc/Kconfig
	drivers/soc/Makefile
	drivers/soc/samsung/Kconfig
	drivers/soc/samsung/Makefile

Change-Id: I1271233bcbbc2509e0a0fe69b24de8b3a0044418