Convert device_sensors to use mojo.

device/sensors/public/interfaces/BUILD.gn

Index: device/sensors/public/interfaces/BUILD.gn
diff --git a/mash/login/public/interfaces/BUILD.gn b/device/sensors/public/interfaces/BUILD.gn
similarity index 79%
copy from mash/login/public/interfaces/BUILD.gn
copy to device/sensors/public/interfaces/BUILD.gn
index 0ea747bed9d6fc0885a76c7384146db4f70fe0a2..f697e347919875e1268ea2608a5e6c446724ccf7 100644
--- a/mash/login/public/interfaces/BUILD.gn
+++ b/device/sensors/public/interfaces/BUILD.gn
@@ -6,6 +6,8 @@ import("//mojo/public/tools/bindings/mojom.gni")
 
 mojom("interfaces") {
   sources = [
-    "login.mojom",
+    "light.mojom",
+    "motion.mojom",
+    "orientation.mojom",
   ]
 }