Revert "Use crosvm's --host-cpu-topology option"

This reverts commit 1afbc0e8358965355813e323ac7c033addada35a.

Reason for revert: Significant reduction in performance in
some runs.

Bug: 266664564
Test: atest -p packages/modules/Virtualization:avf-presubmit
Change-Id: I85dffca279d2267eefe1c5b621d3e1dd78072830
diff --git a/virtualizationmanager/src/atom.rs b/virtualizationmanager/src/atom.rs
index 5c1f394..567fce9 100644
--- a/virtualizationmanager/src/atom.rs
+++ b/virtualizationmanager/src/atom.rs
@@ -82,7 +82,7 @@
 // Returns the number of CPUs configured in the host system.
 // This matches how crosvm determines the number of logical cores.
 // For telemetry purposes only.
-fn get_num_cpus() -> Option<usize> {
+pub(crate) fn get_num_cpus() -> Option<usize> {
     // SAFETY - Only integer constants passed back and forth.
     let ret = unsafe { libc::sysconf(libc::_SC_NPROCESSORS_CONF) };
     if ret > 0 {