hikey: Add Bluetooth HAL sepolicy

Test: builds, files are labeled correctly
Change-Id: Ie14ca17d7c152a02a738bac0f42a0d94e26cfb60
diff --git a/sepolicy/file_contexts b/sepolicy/file_contexts
index dc808fa..5379f90 100644
--- a/sepolicy/file_contexts
+++ b/sepolicy/file_contexts
@@ -6,3 +6,4 @@
 /dev/hci_tty           u:object_r:hci_attach_dev:s0
 /dev/ttyAMA1           u:object_r:hci_attach_dev:s0
 /system/bin/uim        u:object_r:hci_attach_exec:s0
+/system/vendor/bin/hw/android\.hardware\.bluetooth@1\.0-service\.hikey      u:object_r:hal_bluetooth_hikey_exec:s0