Add atrace to core.mk

This change adds the atrace binary and init.trace.rc to the system image for
all builds.

Bug: 6513400
Change-Id: Ib979f4b6ffe799ab56e66fc3acfad754d216c576
diff --git a/target/product/core.mk b/target/product/core.mk
index 58002a7..57c0f44 100644
--- a/target/product/core.mk
+++ b/target/product/core.mk
@@ -43,6 +43,7 @@
     UserDictionaryProvider \
     VpnDialogs \
     apache-xml \
+    atrace \
     bouncycastle \
     bu \
     cacerts \
@@ -121,6 +122,7 @@
 
 PRODUCT_COPY_FILES += \
     system/core/rootdir/init.usb.rc:root/init.usb.rc \
+    system/core/rootdir/init.trace.rc:root/init.trace.rc \
 
 # host-only dependencies
 ifeq ($(WITH_HOST_DALVIK),true)