Remove the testing-purpose APEX keys.

They are embedded in the corresponding APEXes.

Bug: 122047804
Test: m
Change-Id: I244aeb153796b048d78671cd024fec03e4fda083
diff --git a/target/product/base_system.mk b/target/product/base_system.mk
index 392a580..e716598 100644
--- a/target/product/base_system.mk
+++ b/target/product/base_system.mk
@@ -315,10 +315,7 @@
 # Packages included only for eng or userdebug builds, previously debug tagged
 PRODUCT_PACKAGES_DEBUG := \
     adb_keys \
-    apex.test.key \
     arping \
-    com.android.apex.test_package.key \
-    com.android.apex.test_package.preinstall.key \
     iotop \
     iw \
     logpersist.start \