Prop 61: [SIPS-056] Add Morpho to Real Yield USD

This text proposal is to add Morpho support to Real Yield USD. If accepted, a Steward update will enable the adaptor to be added to the Cellar.

See the corresponding forum post for more details: https://community.sommelier.finance/t/sips-056-add-morpho-to-real-yield-usd/1142/2