hal_memtrack: Add sepolicy for memtrack service.

Bug: 31180823
Test: reduced sepolicy errors
Change-Id: Ibfba2efa903adec340e37abec2afb3b94a262678
Signed-off-by: Ruchi Kandoi <kandoiruchi@google.com>

private/file_contexts

@@ -223,6 +223,7 @@
 /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\.memtrack@1\.0-service       u:object_r:hal_memtrack_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

private/hal_memtrack.te

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

public/hal_memtrack.te

+# memtrack subsystem
+type hal_memtrack, domain;
+type hal_memtrack_exec, exec_type, file_type;
+
+# hwbinder access
+hwbinder_use(hal_memtrack);

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_memtrack)
 binder_call(system_server, hal_power)
 binder_call(system_server, hal_vibrator)
 binder_call(system_server, hal_vr)