init.qcom.post_boot: Set bw_hwmon governor for cpubw device on 8996

Enable CPU to DDR bus scaling using hw counters by setting cpubw
devfreq governor to bw_hwmon for MSM8996.

Change-Id: I77e105e6794dd905de3bb525651fef5010421df1

rootdir/etc/init.qcom.post_boot.sh

@@ -1189,6 +1189,10 @@ case "$target" in
         echo 90 > /proc/sys/kernel/sched_downmigrate
         echo 400000 > /proc/sys/kernel/sched_freq_inc_notify
         echo 400000 > /proc/sys/kernel/sched_freq_dec_notify
+        for devfreq_gov in /sys/class/devfreq/qcom,cpubw*/governor
+        do
+            echo "bw_hwmon" > $devfreq_gov
+        done
 
     ;;
 esac