mako: Enable 3 Layer MDP composition

A maximum of 3 UI layers can go through overlays.

Change-Id: I9e7b788609b8fe0c977fa7ce317fedb880540fd7
diff --git a/device.mk b/device.mk
index 9734dd6..83fa811 100644
--- a/device.mk
+++ b/device.mk
@@ -142,6 +142,9 @@
 	persist.audio.handset.mic=dmic \
 	persist.audio.fluence.mode=endfire
 
+#Upto 3 layers can go through overlays
+PRODUCT_PROPERTY_OVERRIDES += debug.mdpcomp.maxlayer=3
+
 PRODUCT_CHARACTERISTICS := nosdcard
 
 PRODUCT_TAGS += dalvik.gc.type-precise