Enable `userfaultfd`-based CMC GC by default on Android S and above.

Before this change, the Concurrent Mark-Compact Garbage Collector
(CMC GC) was enabled by default (provided the kernel supports
`userfaultfd`) on Android T and above. Extend this behavior to
Android S and above.

This reverts commit a9102c122084ced4a5369d2c2174ea1b83b4e1c9.

Change-Id: I378fe28b657704031501c669beddec4afa4838c4
Test: atest art_standalone_odrefresh_tests
Test: atest odsign_e2e_tests odsign_e2e_tests_full
Test: Build bundled module on main with OVERRIDE_ENABLE_UFFD_GC=false,
  check that odrefresh runs on boot, and check that logcat shows
  "Using CollectorTypeCMC GC."
Test: Build module on Mainline branch, install on device running S,
  check that odrefresh runs on reboot, and check that logcat shows
  "Using CollectorTypeCMC GC."
  Reboot again, and check that odrefresh does not run and that logcat
  shows "Using CollectorTypeCMC GC."
Test: Same as above on a device running T, and then:
      adb root
      adb shell device_config set_sync_disabled_for_tests persistent
      adb shell setprop persist.device_config.runtime_native_boot.force_disable_uffd_gc true
      adb reboot
  Check that odrefresh runs on reboot, and check that logcat shows
  "Using CollectorTypeCC GC."
  Reboot again, and check that odrefresh does not run and that logcat
  shows "Using CollectorTypeCC GC."
Bug: 251150519

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