Move selinux permissions to core policy

Allowing system_server to write to apps' timerslack_ns file
is moving to core policy therefore does not need to be granted
in device specific policy.

Bug: 30675296
Test: build
Change-Id: I14ef463f078daab74f3f2a5dfd1b58f6df8fc0d8
diff --git a/sepolicy/system_server.te b/sepolicy/system_server.te
deleted file mode 100644
index 5495da4..0000000
--- a/sepolicy/system_server.te
+++ /dev/null
@@ -1,7 +0,0 @@
-# For writing to /proc/<tid>/timerslack_ns (XXX - this is probably wrong)
-allow system_server priv_app:file write;
-allow system_server untrusted_app:file write;
-allow system_server platform_app:file write;
-allow system_server system_app:file write;
-allow system_server isolated_app:file write;
-allow system_server bluetooth:file write;