[pvmfw][vmbase] Move MemoryTrackerError to vmbase

to simplify the task of moving MemoryTracker to vmbase for reuse
in both rialto and pvmfw.

Bug: 284462758
Test: m pvmfw_img
Change-Id: I73ea492e1fce100898f920d76b87005030f0fef9
diff --git a/pvmfw/src/exceptions.rs b/pvmfw/src/exceptions.rs
index a10c300..4d376cd 100644
--- a/pvmfw/src/exceptions.rs
+++ b/pvmfw/src/exceptions.rs
@@ -14,11 +14,11 @@
 
 //! Exception handlers.
 
-use crate::memory::{MemoryTrackerError, MEMORY};
+use crate::memory::MEMORY;
 use core::fmt;
 use vmbase::console;
 use vmbase::logger;
-use vmbase::memory::page_4kb_of;
+use vmbase::memory::{page_4kb_of, MemoryTrackerError};
 use vmbase::read_sysreg;
 use vmbase::{eprintln, power::reboot};