Add ramdisk_available to init_first_stage's deps am: e8660a008b am: 9495e61bda am: 7311c9d6da

Original change: https://android-review.googlesource.com/c/platform/external/libcxx/+/1736453

Change-Id: I71e5a527eea7c8f6b1ce2632ea45d0fbabc05ee4