bootstat: Implement the SELinux policy to allow reading/writing to

/data/misc/bootstat.

BUG: 21724738
Change-Id: I2789f57cc8182af1a7c33672ef82297f32f54e2e

bootstat.te

+# bootstat command
+type bootstat, domain;
+type bootstat_exec, exec_type, file_type;
+
+init_daemon_domain(bootstat)
+
+# Allow persistent storage in /data/misc/bootstat.
+allow bootstat bootstat_data_file:dir rw_dir_perms;
+allow bootstat bootstat_data_file:file create_file_perms;

file.te

@@ -111,6 +111,7 @@ type storage_stub_file, file_type;
 type adb_keys_file, file_type, data_file_type;
 type audio_data_file, file_type, data_file_type;
 type bluetooth_data_file, file_type, data_file_type;
+type bootstat_data_file, file_type, data_file_type;
 type boottrace_data_file, file_type, data_file_type;
 type camera_data_file, file_type, data_file_type;
 type gatekeeper_data_file, file_type, data_file_type;

file_contexts

@@ -251,6 +251,7 @@
 # Misc data
 /data/misc/adb(/.*)?            u:object_r:adb_keys_file:s0
 /data/misc/audio(/.*)?          u:object_r:audio_data_file:s0
+/data/misc/bootstat(/.*)?       u:object_r:bootstat_data_file:s0
 /data/misc/boottrace(/.*)?      u:object_r:boottrace_data_file:s0
 /data/misc/bluetooth(/.*)?      u:object_r:bluetooth_data_file:s0
 /data/misc/bluedroid(/.*)?      u:object_r:bluetooth_data_file:s0