Add permissions & sepolicy for HBM

* Devices with AMOLED panels use HBM instead of SRE

Change-Id: I6710e038997b04d5d7d6b5f4f6b01d3f18b4750f
diff --git a/sepolicy/file_contexts b/sepolicy/file_contexts
index b856ecc..1e58f14 100644
--- a/sepolicy/file_contexts
+++ b/sepolicy/file_contexts
@@ -39,6 +39,7 @@
 # LiveDisplay
 /sys/devices/virtual/graphics/fb0/aco           u:object_r:livedisplay_sysfs:s0
 /sys/devices/virtual/graphics/fb0/cabc          u:object_r:livedisplay_sysfs:s0
+/sys/devices/virtual/graphics/fb0/hbm           u:object_r:livedisplay_sysfs:s0
 /sys/devices/virtual/graphics/fb0/rgb           u:object_r:livedisplay_sysfs:s0
 /sys/devices/virtual/graphics/fb0/sre           u:object_r:livedisplay_sysfs:s0
 /sys/devices/virtual/graphics/fb0/color_enhance u:object_r:livedisplay_sysfs:s0