XXXX kmem: remove a check that's always false
It's been a very long time since this code ran on systems with less than
24MB RAM.

@@ -4333,16 +4333,10 @@
         size_t maxverify, minfirewall;
 
         kstat_init();
 
         /*
-         * Small-memory systems (< 24 MB) can't handle kmem_flags overhead.
-         */
-        if (physmem < btop(24 << 20) && !(old_kmem_flags & KMF_STICKY))
-                kmem_flags = 0;
-
-        /*
          * Don't do firewalled allocations if the heap is less than 1TB
          * (i.e. on a 32-bit kernel)
          * The resulting VM_NEXTFIT allocations would create too much
          * fragmentation in a small heap.
          */