[pallet-xcm] Adjust benchmarks (teleport_assets/reserve_transfer_assets) not...

[pallet-xcm] Adjust benchmarks (teleport_assets/reserve_transfer_assets) not relying on ED (patch for 1.7.0) (#3465)

For description, please see:
https://github.com/paritytech/polkadot-sdk/pull/3464



Expected patches for (1.6.0):
- cumulus-pallet-parachain-system `0.8.1`
- cumulus-primitives-utility `0.8.1`
- polkadot-runtime-common `8.0.1`
- pallet-xcm-benchmarks `8.0.2`
- pallet-xcm `8.0.0`
- staging-xcm-builder `8.0.0`

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Co-authored-by: Francisco Aguirre <[email protected]>