hikey: powerHAL: Update PowerHAL for top-app category and other tweaks

The initial EAS hikey powerhal was added before N was released, which
introduced the top-app category. So refactor the code to use top-app.

This also tweaks the build so that the module can be more easily
reused on other hardware.

Change-Id: I2847cbf62ea45b15fa2b8d3ee249c153cea351b0
Signed-off-by: John Stultz <john.stultz@linaro.org>
diff --git a/init.common.rc b/init.common.rc
index 81c7aa2..11bc675 100644
--- a/init.common.rc
+++ b/init.common.rc
@@ -66,10 +66,15 @@
     #
     # EAS stune boosting interfaces
     #
+    chown system system /dev/stune/top-app/schedtune.boost
+    chown system system /dev/stune/top-app/schedtune.prefer_idle
     chown system system /dev/stune/foreground/schedtune.boost
     chown system system /dev/stune/foreground/schedtune.prefer_idle
     chown system system /dev/stune/schedtune.boost
-    write /dev/stune/foreground/schedtune.boost 10
+
+    write /dev/stune/top-app/schedtune.boost 10
+    write /dev/stune/top-app/schedtune.prefer_idle 1
+    write /dev/stune/foreground/schedtune.boost 0
     write /dev/stune/foreground/schedtune.prefer_idle 1
     write /dev/stune/schedtune.boost 0