[pvmfw] Move dirty state management control util to vmbase

As part of the project of moving the memory management code from
pvmfw to vmbase so that we can reuse it in rialto.

Bug: 284462758
Test: m pvmfw_img
Change-Id: I2cf71f04551af500627c2777b37d7e5a7d8b4a1d
diff --git a/vmbase/src/memory/mod.rs b/vmbase/src/memory/mod.rs
new file mode 100644
index 0000000..c4990f2
--- /dev/null
+++ b/vmbase/src/memory/mod.rs
@@ -0,0 +1,19 @@
+// Copyright 2023, The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! Memory management.
+
+mod dbm;
+
+pub use dbm::set_dbm_enabled;