Vstam1/xcm admin origin (#6928)

* 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

---------

Co-authored-by: serkul <serkul@pop-os.localdomain>

polkadot/xcm/pallet-xcm/src/mock.rs

@@ -20,6 +20,7 @@ use frame_support::{
 	traits::{ConstU32, Everything, Nothing},
 	weights::Weight,
 };
+use frame_system::EnsureRoot;
 use polkadot_parachain::primitives::Id as ParaId;
 use polkadot_runtime_parachains::origin;
 use sp_core::H256;
@@ -344,6 +345,7 @@ impl pallet_xcm::Config for Test {
 	type WeightInfo = TestWeightInfo;
 	#[cfg(feature = "runtime-benchmarks")]
 	type ReachableDest = ReachableDest;
+	type AdminOrigin = EnsureRoot<AccountId>;
 }
 
 impl origin::Config for Test {}