hal_power: Add sepolicy for power service.

Bug: 31177288
Test: reduced sepolicy errors
Change-Id: I29556276ee14c341ac8f472875e6b69f903851ff
Signed-off-by: Ruchi Kandoi <kandoiruchi@google.com>

private/file_contexts

@@ -224,6 +224,7 @@
 /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\.power@1\.0-service          u:object_r:hal_power_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
 /system/bin/hw/android\.hardware\.wifi@1\.0-service           u:object_r:hal_wifi_exec:s0

private/hal_power.te

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

public/hal_power.te

+# power subsystem
+type hal_power, domain;
+type hal_power_exec, exec_type, file_type;
+
+# hwbinder access
+hwbinder_use(hal_power);

public/system_server.te

@@ -149,6 +149,7 @@ allow system_server surfaceflinger:unix_stream_socket { read write setopt };
 binder_use(system_server)
 binder_call(system_server, hal_boot)
 binder_call(system_server, hal_light)
+binder_call(system_server, hal_power)
 binder_call(system_server, hal_vibrator)
 binder_call(system_server, hal_vr)
 binder_call(system_server, binderservicedomain)