Move gpu_device type and rules to core policy.

Change-Id: I3ce0b4bd25e078698a1c50242aaed414bf5cb517
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
diff --git a/system_server.te b/system_server.te
index f603ea3..2afafa6 100644
--- a/system_server.te
+++ b/system_server.te
@@ -110,6 +110,7 @@
 allow system_server device:dir r_dir_perms;
 allow system_server mdns_socket:sock_file rw_file_perms;
 allow system_server alarm_device:chr_file rw_file_perms;
+allow system_server gpu_device:chr_file rw_file_perms;
 allow system_server graphics_device:dir search;
 allow system_server graphics_device:chr_file rw_file_perms;
 allow system_server iio_device:chr_file rw_file_perms;