[pvmfw] Move memory flush functions to vmbase

To facilitate reusing the memory management code in rialto later.

Bug: 284462758
Test: m pvmfw_img
Change-Id: I9a544c783ff322d4894f0b3d7e10c0643908d48f
diff --git a/vmbase/Android.bp b/vmbase/Android.bp
index 72be0b0..bda3796 100644
--- a/vmbase/Android.bp
+++ b/vmbase/Android.bp
@@ -69,6 +69,7 @@
         "liblog_rust_nostd",
         "libsmccc",
         "libspin_nostd",
+        "libzeroize_nostd",
     ],
     whole_static_libs: [
         "librust_baremetal",