WIP: sepolicy: mostly fixup graphics denials

Still not done, need androidboot.selinux=permissive to get to UI.

~#============= platform_app ==============

~#!!!! This avc is a constraint violation.  You would need to modify the attributes of either the source or target types to allow this access.
~#Constraint rule:
~#       mlsconstrain file { write setattr append unlink link rename } ((t2 == app_data_file_type -Fail-)  or (t2 == appdomain_tmpfs -Fail-)  or (l1 eq l2 -Fail-)  or (t1 == mlstrustedsubject -Fail-)  or (t2 == mlstrustedobject -Fail-) ); Constraint DENIED

~#       Possible cause is the source level (s0:c512,c768) and target level (s0) are different.
allow platform_app hal_graphics_allocator_default_tmpfs:file write;
allow platform_app tmpfs:file { read write };
diff --git a/sepolicy/system_app.te b/sepolicy/system_app.te
index 4a85066..6a2112d 100644
--- a/sepolicy/system_app.te
+++ b/sepolicy/system_app.te
@@ -1 +1,3 @@
+allow system_app hal_graphics_allocator_default_tmpfs:file { read write };
+
 gpu_access(system_app)