Revert^2 "add sepolicy type for widevine/drm hal in system"

This reverts commit a0e696357c7f3da72ebdb6237b2343e6b8a7afac.

Reason for revert: https://googleplex-android-review.git.corp.google.com/q/hashtag:%22b/398929391%22+(status:open%20OR%20status:merged)

Change-Id: I379734cc1adb33b874ba35daa9ace7485c79baa8
diff --git a/private/hal_drm.te b/private/hal_drm.te
index 211fbb7..f24c326 100644
--- a/private/hal_drm.te
+++ b/private/hal_drm.te
@@ -33,7 +33,7 @@
 allow hal_drm_server shell:fifo_file write;
 
 # Allow access to ion memory allocation device
-allow hal_drm ion_device:chr_file rw_file_perms;
+allow { hal_drm -hal_widevine_system } ion_device:chr_file rw_file_perms;
 allow hal_drm hal_graphics_allocator:fd use;
 
 # Allow access to hidl_memory allocation service
@@ -42,9 +42,9 @@
 # Allow access to fds allocated by mediaserver
 allow hal_drm mediaserver:fd use;
 
-allow hal_drm sysfs:file r_file_perms;
+allow { hal_drm -hal_widevine_system } sysfs:file r_file_perms;
 
-allow hal_drm tee_device:chr_file rw_file_perms;
+allow { hal_drm -hal_widevine_system } tee_device:chr_file rw_file_perms;
 
 allow hal_drm_server { appdomain -isolated_app }:fd use;