vmm: Factorize algorithm finding HOB memory resources

By factorizing the algorithm untangling TDVF sections from guest RAM
into a dedicated function, we can write some unit tests to validate it
properly achieves what we expect.

Adding the "tdx" feature to the unit tests, otherwise it wouldn't get
tested.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>

scripts/run_unit_tests.sh

@@ -11,6 +11,8 @@ cargo_args=("")
 if [[ $hypervisor = "mshv" ]]; then
     cargo_args+=("--no-default-features")
     cargo_args+=("--features common,$hypervisor")
+elif [[ $(uname -m) = "x86_64" ]]; then
+    cargo_args+=("--features tdx")
 fi
 
 if [[ "${BUILD_TARGET}" == "aarch64-unknown-linux-musl" ]]; then