Add hal_dumpstate attribute.

- Also allow dumpstate to talk to hal_dumpstate.

Bug: 31982882
Test: compiles
Change-Id: Ib9cf0027ee7e71fa40b9ccc29fc8dccea6977e5c
diff --git a/public/hal_dumpstate.te b/public/hal_dumpstate.te
new file mode 100644
index 0000000..3312b0a
--- /dev/null
+++ b/public/hal_dumpstate.te
@@ -0,0 +1,5 @@
+# hwbinder access
+hwbinder_use(hal_dumpstate)
+
+# call into dumpstate process (callbacks)
+binder_call(hal_dumpstate, dumpstate)