wifi: add support for semcosh nvram

Change-Id: I272607b2835c5df97b8e175a9bcd559b3ec1a105
libhardware_legacy: change DVFS stub dependency

* Make this it's own define, Exynos 5410 uses SAMSUNG_DVFS as well.

Change-Id: I1eed4a8999b1593d030b7e1ae4133937a2720f70