asset-hub-rococo: genesis config presets added (#3996)

Gensis config presets moved from `polkadot-parachain` binary into
`asset-hub-rococo` runtime.

relates to: #3944

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Co-authored-by: Dónal Murray <donal.murray@parity.io>
Co-authored-by: Bastian Köcher <git@kchr.de>