add vnc server integration bits

[nift4: squashed "sepolicy fix for vncflinger_exec"]

etc/vncflinger.rc

@@ -10,3 +10,7 @@ on property:persist.vnc.enable=true
 
 on property:persist.vnc.enable=false
     stop vncflinger
+
+on boot
+    # vnc
+    chmod 0666 /dev/uinput

sepolicy/file_contexts

 /system/bin/vncflinger   u:object_r:vncflinger_exec:s0
+/system/bin/vncpasswd    u:object_r:vncflinger_exec:s0

sepolicy/system_app.te

+allow system_app vncflinger_exec:file { r_file_perms execute execute_no_trans map };
+
+# uinput
+allow system_app uhid_device:chr_file rw_file_perms;

sepolicy/vncflinger.te

-type vncflinger_exec, exec_type, file_type;
+type vncflinger_exec, exec_type, file_type, system_file_type;
 type vncflinger, domain;
 typeattribute vncflinger coredomain;