Add domains for goldfish services.

goldfish-setup, goldfish-logcat, and qemu-props are goldfish-specific
oneshot services that lacked domain definitions and thus were left in init's
domain.

This depends on a change to external/sepolicy with the same Change-Id
to define non-goldfish-specific types for properties and logcat.

Change-Id: Idce1fb5ed9680af84788ae69a5ace684c6663974
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
diff --git a/target/board/generic/sepolicy/property_contexts b/target/board/generic/sepolicy/property_contexts
new file mode 100644
index 0000000..5f741f8
--- /dev/null
+++ b/target/board/generic/sepolicy/property_contexts
@@ -0,0 +1 @@
+qemu.                   u:object_r:qemu_prop:s0