pkg/sysinfo: remove NUMANodeCount

Found a few issues in this code and went ahead to fix them one by one,
only to find out this function is not used anywhere in our codebase
or otherwise (see [1], [2]).

Remove it.

[1]: https://github.com/search?q=org%3Acontainers+NUMANodeCount&type=code
[2]: https://sourcegraph.com/search?q=context%3Aglobal+sysinfo.NUMANodeCount

Signed-off-by: Kir Kolyshkin <[email protected]>

Author: kolyshkin

pkg/sysinfo/nummem_linux.go

@@ -97,13 +97,3 @@ func TestNumCPU(t *testing.T) {
 		t.Fatal("CPU returned must be greater than zero")
 	}
 }
-
-func TestNumMems(t *testing.T) {
-	if _, err := os.Stat("/proc/self/numa_maps"); !errors.Is(err, os.ErrNotExist) {
-		t.Skip("NUMA must be supported")
-	}
-	cpuMems := NUMANodeCount()
-	if cpuMems < 0 {
-		t.Fatal("Invalid number of memory nodes, must be 0 or greater.")
-	}
-}