[pvmfw][vmbase] Move MemoryTracker to vmbase for reuse

No behavior change in this cl.

Bug: 284462758
Test: m pvmfw_img
Change-Id: Id2970e3e8bb87d7c43903fe7e750b3c944178905
diff --git a/pvmfw/src/main.rs b/pvmfw/src/main.rs
index 8d48098..6a5151c 100644
--- a/pvmfw/src/main.rs
+++ b/pvmfw/src/main.rs
@@ -42,7 +42,6 @@
 use crate::fdt::modify_for_next_stage;
 use crate::helpers::GUEST_PAGE_SIZE;
 use crate::instance::get_or_generate_instance_salt;
-use crate::memory::MEMORY;
 use crate::virtio::pci;
 use alloc::boxed::Box;
 use core::ops::Range;
@@ -55,6 +54,7 @@
 use pvmfw_avb::DebugLevel;
 use pvmfw_embedded_key::PUBLIC_KEY;
 use vmbase::memory::flush;
+use vmbase::memory::MEMORY;
 
 const NEXT_BCC_SIZE: usize = GUEST_PAGE_SIZE;