Update git submodules

* Update system/core from branch 'master'
  to 1acfc08e3090351e00bd4428037b1b75ff721266
  - Merge "libsnapshot: Add more feature flags to SnapshotMergeReport."
  - libsnapshot: Add more feature flags to SnapshotMergeReport.
    
    This patch also begins reducing the complexity of SnapshotMergeStats by
    eliminating the indirection layer between the protobuf and
    SnapshotManager.
    
    Bug: 222117189
    Test: statsd_testdrive
    Change-Id: I15d740121c381da7d8311f0cbbd0da82db877555
    
diff --git a/system/core b/system/core
index 3c8a95e..1acfc08 160000
--- a/system/core
+++ b/system/core
@@ -1 +1 @@
-Subproject commit 3c8a95e3be7c98849c7ed30b377d0c94ddd485fc
+Subproject commit 1acfc08e3090351e00bd4428037b1b75ff721266