Avoid denial on dumpstate

Cuttlefish uses a reference implementation of the neural networking HAL
called hal_neuralnetworks_sample, which is not included in public
sepolicy. This means when the dumpstate call is made to the server
process, it generates a denial.

This should fix failures with the CTS test:
android.security.cts.SELinuxHostTest#testNoBugreportDenials

Bug: 156418420
Change-Id: I2b1303192d3c98f2e092fc09588d11399ec0e168
diff --git a/shared/sepolicy/vendor/dumpstate.te b/shared/sepolicy/vendor/dumpstate.te
new file mode 100644
index 0000000..34caf72
--- /dev/null
+++ b/shared/sepolicy/vendor/dumpstate.te
@@ -0,0 +1 @@
+allow dumpstate hal_neuralnetworks_sample:process signal;