Android 12.1.0 release 21
Revert "Add ramdisk_available to init_first_stage's deps" am: 9c79e27ef0

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/libcxx/+/15167744

Change-Id: Id77c150f9b8c189e9790534adf09046c37a74fed