Allow 'system' user to modify cpufreq control files

This is needed by new CPU Settings in CMParts

Change-Id: I0ec4e0b1705670034a433df549b2895985c476af

prebuilt/common/etc/init.local.rc

@@ -29,6 +29,14 @@ on boot
     write /sys/kernel/mm/ksm/sleep_millisecs 1500
     write /sys/kernel/mm/ksm/pages_to_scan 256
 
+    # allow system to modify cpufreq control files
+    chown root system /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
+    chmod 0664 /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
+    chown root system /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
+    chmod 0664 /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
+    chown root system /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq
+    chmod 0664 /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq
+
 # adb over network
 on property:service.adb.tcp.port=5555
     stop adbd