Add permissions & sepolicy for HBM

* Devices with AMOLED panels use HBM instead of SRE

Change-Id: I6710e038997b04d5d7d6b5f4f6b01d3f18b4750f
diff --git a/prebuilt/common/etc/init.local.rc b/prebuilt/common/etc/init.local.rc
index 42c535f..101280e 100644
--- a/prebuilt/common/etc/init.local.rc
+++ b/prebuilt/common/etc/init.local.rc
@@ -122,6 +122,8 @@
     chmod 0660 /sys/devices/virtual/graphics/fb0/aco
     chown system system /sys/devices/virtual/graphics/fb0/cabc
     chmod 0660 /sys/devices/virtual/graphics/fb0/cabc
+    chown system system /sys/devices/virtual/graphics/fb0/hbm
+    chmod 0660 /sys/devices/virtual/graphics/fb0/hbm
     chown system system /sys/devices/virtual/graphics/fb0/rgb
     chmod 0660 /sys/devices/virtual/graphics/fb0/rgb
     chown system system /sys/devices/virtual/graphics/fb0/sre