Revert "isolated_app: Do not allow access to the gpu_device."

Chrome team recommends reverting this patch and introducing
it into a future version of Android, to avoid potential
compatibility issues.

This reverts commit 9de62d6f.

Bug: 17471434
Bug: 18609318
Change-Id: I9adaa9d0e4cb6a592011336e442e9d414dbac470

app.te

@@ -91,7 +91,7 @@ allow appdomain qtaguid_device:chr_file r_file_perms;
 
 # Grant GPU access to all processes started by Zygote.
 # They need that to render the standard UI.
-allow { appdomain -isolated_app } gpu_device:chr_file { rw_file_perms execute };
+allow appdomain gpu_device:chr_file { rw_file_perms execute };
 
 # Use the Binder.
 binder_use(appdomain)

isolated_app.te

@@ -18,9 +18,6 @@ allow isolated_app app_data_file:file { read write getattr };
 # Isolated apps should not directly open app data files themselves.
 neverallow isolated_app app_data_file:file open;
 
-# Isolated apps shouldn't be able to access the driver directly.
-neverallow isolated_app gpu_device:file { rw_file_perms execute };
-
 allow isolated_app radio_service:service_manager find;
 allow isolated_app surfaceflinger_service:service_manager find;
 allow isolated_app system_server_service:service_manager find;