Disallow sysfs_leds to coredomains.

Bug: 70846424
Test: neverallow not tripped
Change-Id: I9e351ee906162a594930b5ab300facb5fe807f13

private/coredomain.te

 get_prop(coredomain, pm_prop)
 get_prop(coredomain, exported_pm_prop)
+
+full_treble_only(`
+neverallow {
+    coredomain
+    -init
+    -vendor_init
+
+    # generic access to sysfs_type
+    -ueventd
+    -vold
+    -priv_app
+    -storaged
+    -system_app
+} sysfs_leds:file *;
+')