logcat: permit transition to Android.bp

Permit transition of logcat to Android.bp by moving the debug
target logpersist.start to the PRODUCT_PACKAGES_DEBUG list.

Test: compile
Change-Id: I6cfd4c40f848a2ff2661e3692fa8cd69ed99e8c9
diff --git a/target/product/base.mk b/target/product/base.mk
index 89027bf..62c1354 100644
--- a/target/product/base.mk
+++ b/target/product/base.mk
@@ -132,6 +132,7 @@
 
 # Packages included only for eng or userdebug builds, previously debug tagged
 PRODUCT_PACKAGES_DEBUG := \
+    logpersist.start \
     perfprofd \
     sqlite3