Add extra logging for A/B dexopt

Log the packages for which we skip dex2oat because they are already
preopted.

Bug: 68949006
Test: make
Change-Id: Ia8983886bd130405dedeec79f7ad03aeab7090a6
diff --git a/cmds/installd/otapreopt.cpp b/cmds/installd/otapreopt.cpp
index e0d23da..0c2d341 100644
--- a/cmds/installd/otapreopt.cpp
+++ b/cmds/installd/otapreopt.cpp
@@ -889,6 +889,7 @@
                 CHECK(EndsWith(path, "/"));
                 path = path + "oat";
                 if (access(path.c_str(), F_OK) == 0) {
+                    LOG(INFO) << "Skipping A/B OTA preopt of already preopted package " << apk_path;
                     return true;
                 }
             }
@@ -900,7 +901,7 @@
         // this tool will wipe the OTA artifact cache and try again (for robustness after
         // a failed OTA with remaining cache artifacts).
         if (access(apk_path, F_OK) != 0) {
-            LOG(WARNING) << "Skipping preopt of non-existing package " << apk_path;
+            LOG(WARNING) << "Skipping A/B OTA preopt of non-existing package " << apk_path;
             return true;
         }