flounder: limit dex2oat to one thread

Denver processor only has 2 cpus, we should limit dex2oat
background operations to 1 thread and the associated lower
memory footprint so that the impact is controlled.

Bug: 34114061
Test: manual smoke test
Change-Id: I1f32b1734aad5765223959a9735a66b086e3448a
diff --git a/device.mk b/device.mk
index 6a40714..0735702 100644
--- a/device.mk
+++ b/device.mk
@@ -226,6 +226,9 @@
 
 # setup dalvik vm configs.
 $(call inherit-product, frameworks/native/build/tablet-10in-xhdpi-2048-dalvik-heap.mk)
+# N9 has only two CPUs, so drop dex2oat pressure after boot at runtime
+PRODUCT_PROPERTY_OVERRIDES += \
+    dalvik.vm.dex2oat-threads=1
 
 # for off charging mode
 PRODUCT_PACKAGES += \