use compiled kernel module instead of prebuilt

using a prebuilt wireless.ko often causes wifi not working

Change-Id: I3962c58869b0f83bd2cc4f97f54fa0e7855b7645
Merge branch 'cm-10.1' of github.com:CyanogenMod/android_device_lge_p990 into cm-10.1
cc path in boardconfig
Revert "cc path in boardconfig"

This reverts commit 1332e3c972be0b9d9c930b655512664f9d9753e9.