Remove AsyncTask from the preload classes blacklist

Bug: 116364973
Test: build & reboot
Change-Id: I2475d9c34c0635d8a8f21abe3246d67fdd7273d2
diff --git a/config/preloaded-classes b/config/preloaded-classes
index b4fd031..03e3b82 100644
--- a/config/preloaded-classes
+++ b/config/preloaded-classes
@@ -2696,6 +2696,7 @@
 android.os.-$$Lambda$Trace$2zLZ-Lc2kAXsVjw_nLYeNhqmGq0
 android.os.-$$Lambda$q1UvBdLgHRZVzc68BxdksTmbuCw
 android.os.AsyncResult
+android.os.AsyncTask
 android.os.AsyncTask$1
 android.os.AsyncTask$2
 android.os.AsyncTask$3