Camera: sepolicy for external camera

Allow external camera HAL to monitor video device add/removal.

Bug: 64874137
Change-Id: I1a3116a220df63c0aabb3c9afd7450552e6cd417

public/hal_camera.te

@@ -5,6 +5,7 @@ binder_call(hal_camera_server, hal_camera_client)
 add_hwservice(hal_camera_server, hal_camera_hwservice)
 allow hal_camera_client hal_camera_hwservice:hwservice_manager find;
 
+allow hal_camera device:dir r_dir_perms;
 allow hal_camera video_device:dir r_dir_perms;
 allow hal_camera video_device:chr_file rw_file_perms;
 allow hal_camera camera_device:chr_file rw_file_perms;