init.angler.power.sh: change GPU initial power level

change GPU initial power level from 305MHz(level 4)
to 180MHz(level 5) for power savings

Bug: 22912703

Change-Id: I29b0c4ee00e5a9c9e80d18590a344b3e148397ea
diff --git a/init.angler.power.sh b/init.angler.power.sh
index a19316e..8254e62 100755
--- a/init.angler.power.sh
+++ b/init.angler.power.sh
@@ -112,3 +112,6 @@
 get-set-forall /sys/devices/soc.0/qcom,bcl.*/hotplug_mask $bcl_hotplug_mask
 get-set-forall /sys/devices/soc.0/qcom,bcl.*/hotplug_soc_mask $bcl_hotplug_soc_mask
 get-set-forall /sys/devices/soc.0/qcom,bcl.*/mode enable
+
+# change GPU initial power level from 305MHz(level 4) to 180MHz(level 5) for power savings
+write /sys/class/kgsl/kgsl-3d0/default_pwrlevel 5