* Ensure for a configurable origin in XCM (#6442), cherry picked from
5ae05e1a957857c449a43d8759a21292d03fd049

Add new associated type, AdminOrigin, bounded by EnsureOrigin trait in
XCM pallet. Replace ensure_root() with ensure_origin() from a
EnsureOrigin trait. Set AdminOrigin as EnsureRoot<AccountId> in xcm
configs.

* cargo fmt

* small stylistic change

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Co-authored-by: serkul <[email protected]>