centralize common settings for edgeTPU

Bug: 258114806
Test: build pass with all the things still in the ROM
Change-Id: Iafa355c047d39cfb21ef043ed0e7b4108630b781
diff --git a/edgetpu/sepolicy/device.te b/edgetpu/sepolicy/device.te
new file mode 100644
index 0000000..9296ba5
--- /dev/null
+++ b/edgetpu/sepolicy/device.te
@@ -0,0 +1,2 @@
+# EdgeTPU device (DarwiNN)
+type edgetpu_device, dev_type, mlstrustedobject;