Remove surfaceflinger access to sysfs.

Bug: 65643247
Test: SurfaceFlinger_test passes (except known failures) without selinux
denials
Change-Id: I6ce185f92e5ad64a172da7d7e12167d8da2ebed0

private/surfaceflinger.te

@@ -84,7 +84,6 @@ allow surfaceflinger window_service:service_manager find;
 allow surfaceflinger self:capability sys_nice;
 allow surfaceflinger proc_meminfo:file r_file_perms;
 r_dir_file(surfaceflinger, cgroup)
-r_dir_file(surfaceflinger, sysfs_type)
 r_dir_file(surfaceflinger, system_file)
 allow surfaceflinger tmpfs:dir r_dir_perms;
 allow surfaceflinger system_server:fd use;