qcom-common: msm8974 to build barrier and add updated init files

Change-Id: I1923a06728ce96d421548cf5e27ea0eeddf972cf
qcom-common: Update cpufreq settings

 * Set defaults for 8960 in case we're not using CM PowerHAL
 * Switch 8974 to interactive

Change-Id: I18bc8b23eb79a66c2cb208d3507d78ab42481984