Revert "Prima: CORE/HDD LINUX_VERSION_CODE hack"

This reverts commit 172e0960c297468926d84f28a83241830f5e7dd5.
Revert "prima: wlan_hdd_main: Add kernel version ifdef"

This reverts commit cd76de64bd57cd42e165313d27b6bd70a15cc740.
prima: Support 3.0 kernel with wireless code updated to 3.4 level

Change-Id: Ia5dbd423fbb6602603f22f8cab4e0882af50addf
defconfig: Make CFG80211 built-in

Change-Id: Ia89b524d4f81da76476aa21a7f10a2a49f9b13b4