Define ss58 prefix inside the runtime (#7810)

* Add SS58Prefix type to the frame_system config trait

* Remove unused chain_id runtime interface

Author: athei

benchmarking/src/mock.rs

@@ -63,6 +63,7 @@ impl frame_system::Config for Test {
 	type OnNewAccount = ();
 	type OnKilledAccount = (Balances,);
 	type SystemWeightInfo = ();
+	type SS58Prefix = ();
 }
 parameter_types! {
 	pub const ExistentialDeposit: Balance = 10;

src/mock.rs

@@ -116,6 +116,7 @@ impl frame_system::Config for Runtime {
 	type OnNewAccount = ();
 	type OnKilledAccount = ();
 	type SystemWeightInfo = ();
+	type SS58Prefix = ();
 }
 
 parameter_types! {