overlay: Introduce some more miscellaneous overlay entries

* Clearly distinguish operator and non-operator overlay configs.
* This would be the base for all operator changes which is taken as
it is from qcom/common project.
* Few duplicate overlays that are already defined in device overlays
are cleaned up.

Issue: FP3-A11#231
Change-Id: I933e409a3c251423c5545403d015b9d4fe524a71
diff --git a/device.mk b/device.mk
index 964e2dd..7a79bd9 100644
--- a/device.mk
+++ b/device.mk
@@ -46,6 +46,11 @@
 # data can only be generated at the factory so don't generate persist.img
 FP3_SKIP_PERSIST_IMG := true
 
+
+# Operator specific overlays
+DEVICE_PACKAGE_OVERLAYS += \
+	$(LOCAL_PATH)/overlay-operators
+
 # Overlays
 DEVICE_PACKAGE_OVERLAYS += \
 	$(LOCAL_PATH)/overlay