The purpose of this call is to initialize the Polkadot side of the Polkadot<>Kusama bridge.
It does the following:
Calls forceXcmVersion on following system parachains to set XCMv3 between:
Polkadot AH <-> Polkadot BH
Polkadot BH -> Kusama BH
Polkadot AH -> Kusama AH
It then calls bridgePolkadotGrandpa::initialize() with the initial configuration for the Kusama on-chain light-cLient running on Polkadot Bridge Hub.
Whitelisted by: https://collectives.subsquare.io/fellowship/referenda/83