perf: Change heapminfree

The 1GB heap setting is having a heapminfree
value of 512k. This is not correct, and changed
to 2m in line with KK settings.

This change reduces GC significantly during app
launch on L, there by improving the first launch
latency.

CRs-Fixed: 774352

Change-Id: I701e429d59b3a2d8cccc4b87649ae866f4d78612
diff --git a/build/phone-xhdpi-1024-dalvik-heap.mk b/build/phone-xhdpi-1024-dalvik-heap.mk
index 221227d..20f365f 100644
--- a/build/phone-xhdpi-1024-dalvik-heap.mk
+++ b/build/phone-xhdpi-1024-dalvik-heap.mk
@@ -21,5 +21,5 @@
     dalvik.vm.heapgrowthlimit=96m \
     dalvik.vm.heapsize=256m \
     dalvik.vm.heaptargetutilization=0.75 \
-    dalvik.vm.heapminfree=512k \
+    dalvik.vm.heapminfree=2m \
     dalvik.vm.heapmaxfree=8m