Sepolicy for light hal.

Bug: 32022100
Test: end to end
Change-Id: I5dd9b64c98a5c549fdaf9e47d5a92fa6963370c7

private/file_contexts

@@ -222,6 +222,7 @@
 /system/lib(64)?/libart.*        u:object_r:libart_file:s0
 /system/bin/hw/android\.hardware\.audio@2\.0-service          u:object_r:hal_audio_exec:s0
 /system/bin/hw/android\.hardware\.boot@1\.0-service           u:object_r:hal_boot_exec:s0
+/system/bin/hw/android\.hardware\.light@2\.0-service          u:object_r:hal_light_exec:s0
 /system/bin/hw/android\.hardware\.nfc@1\.0-service            u:object_r:hal_nfc_exec:s0
 /system/bin/hw/android\.hardware\.vibrator@1\.0-service       u:object_r:hal_vibrator_exec:s0
 /system/bin/hw/android\.hardware\.vr@1\.0-service             u:object_r:hal_vr_exec:s0

private/hal_light.te

+# may be started by init
+init_daemon_domain(hal_light)

public/hal_light.te

+# light subsystem
+type hal_light, domain;
+type hal_light_exec, exec_type, file_type;
+
+# hwbinder access
+hwbinder_use(hal_light)
+
+# call into system_server process (callbacks)
+binder_call(hal_light, system_server)

public/system_server.te

@@ -148,6 +148,7 @@ allow system_server surfaceflinger:unix_stream_socket { read write setopt };
 # Perform Binder IPC.
 binder_use(system_server)
 binder_call(system_server, hal_boot)
+binder_call(system_server, hal_light)
 binder_call(system_server, hal_vibrator)
 binder_call(system_server, hal_vr)
 binder_call(system_server, binderservicedomain)