Add DeviceParts with most of Doze and Gestures features

Taken from oneplus6 and edit for our zenfone 6
diff --git a/DeviceParts/res/drawable/back.xml b/DeviceParts/res/drawable/back.xml
new file mode 100644
index 0000000..3345310
--- /dev/null
+++ b/DeviceParts/res/drawable/back.xml
@@ -0,0 +1,9 @@
+<!-- drawable/arrow_left.xml -->

+<vector xmlns:android="http://schemas.android.com/apk/res/android"

+    android:height="24dp"

+    android:width="24dp"

+    android:viewportWidth="24"

+    android:viewportHeight="24"

+    android:tint="?android:attr/colorAccent">

+    <path android:fillColor="#000" android:pathData="M20,11V13H8L13.5,18.5L12.08,19.92L4.16,12L12.08,4.08L13.5,5.5L8,11H20Z" />

+</vector>