pvmfw: Use tinyvec::ArrayVec in MemoryTracker

Instead of a DIY implementation, make use of the crate-provided struct.

Test: atest MicrodroidTestApp
Change-Id: I19418245f990a4be2300890767a1004e21b48ee7
diff --git a/pvmfw/Android.bp b/pvmfw/Android.bp
index 455b214..b78e077 100644
--- a/pvmfw/Android.bp
+++ b/pvmfw/Android.bp
@@ -17,6 +17,7 @@
         "liblibfdt",
         "liblog_rust_nostd",
         "libpvmfw_embedded_key",
+        "libtinyvec_nostd",
         "libvmbase",
     ],
     static_libs: [