Revert "Add mkbootfs to build-tools" am: 8c4e38f41b am: 9c75231ecd am: 8dff40fb4f am: 24b58e84af

Original change: https://android-review.googlesource.com/c/platform/prebuilts/build-tools/+/1696949

Change-Id: Ia470b4905363178b96ccd36823b65f3c4dafb9bd