kitakami-common: sepolicy: Labeled clean_scratch_files and addressed it.

to suppress error messages like this one: "Could not start exec background service: File /system/bin/clean_scratch_files (labeled u:object_r:system_file:s0) has incorrect label or no domain transition from u:r:init:s0 to another SELinux domain defined."

Change-Id: Ic33a6e6ecd18d5de79a675bafbb7a605cfd2dda7

sepolicy/vendor/clean_scratch_files.te

+type clean_scratch_files, domain;
+type clean_scratch_files_exec, exec_type, file_type;
+
+# Started by init
+init_daemon_domain(clean_scratch_files)
+

sepolicy/vendor/file_contexts

@@ -65,6 +65,7 @@
 
 # Misc
 /system/bin/adsprpcd                                       u:object_r:adsprpcd_exec:s0
+/system/bin/clean_scratch_files                            u:object_r:clean_scratch_files_exec:s0
 /system/bin/iddd                                           u:object_r:iddd_exec:s0
 /system/bin/init\.qcom\.power\.sh                          u:object_r:init-power-sh_exec:s0
 /system/bin/irsc_util                                      u:object_r:irsc_util_exec:s0