Revert "Optimize merkle proofs for efficient verification in Solidity (#12857)" (#14176)

* Revert "Optimize merkle proofs for efficient verification in Solidity (#12857)"

This reverts commit c077597afb since we
still require commitment to the leaves - see #12820.

* remove PartialOrd trait from mmr hash type

substrate/frame/merkle-mountain-range/src/lib.rs

@@ -163,8 +163,7 @@ pub mod pallet {
 			+ codec::Codec
 			+ codec::EncodeLike
 			+ scale_info::TypeInfo
-			+ MaxEncodedLen
-			+ PartialOrd;
+			+ MaxEncodedLen;
 
 		/// Data stored in the leaf nodes.
 		///