Use ART_APEX_JARS instead of hard-coded list of ART boot jars.

Test: qemu_trusty_arm64-userdebug builds.

Change-Id: I780753ff3ca11601292938aa52a57087001e1a3d
diff --git a/qemu_trusty_base.mk b/qemu_trusty_base.mk
index f8cf3ff..4d50f31 100644
--- a/qemu_trusty_base.mk
+++ b/qemu_trusty_base.mk
@@ -105,12 +105,7 @@
     VtsHalKeymasterV4_0TargetTest \
 
 PRODUCT_BOOT_JARS := \
-    core-oj \
-    core-libart \
-    core-icu4j \
-    okhttp \
-    bouncycastle \
-    apache-xml \
+    $(ART_APEX_JARS) \
     ext \
     framework-minus-apex \
     telephony-common \