Remove deprecated RawEvent types from some pallets (#11316)

Signed-off-by: koushiro <koushiro.cqx@gmail.com>

substrate/frame/indices/src/lib.rs

@@ -270,10 +270,6 @@ pub mod pallet {
 		IndexFrozen { index: T::AccountIndex, who: T::AccountId },
 	}
 
-	/// Old name generated by `decl_event`.
-	#[deprecated(note = "use `Event` instead")]
-	pub type RawEvent<T> = Event<T>;
-
 	#[pallet::error]
 	pub enum Error<T> {
 		/// The index was not already assigned.