chore(l2): remove unused revm modules (#2587)

**Motivation**

Now that the L2 has fully defaulted to levm, both for execution and
proving, these modules became unused.

**Description**

<!-- A clear and concise general description of the changes this PR
introduces -->

<!-- Link to issues: Resolves #111, Resolves #222 -->

Closes #issue_number

Author: jrchatruc

crates/vm/backends/revm/execution_db.rs

@@ -1,7 +1,5 @@
 pub mod db;
 pub mod helpers;
-#[cfg(feature = "l2")]
-mod mods;
 
 use super::BlockExecutionResult;
 use crate::constants::{
@@ -412,21 +410,6 @@ fn run_evm(
             .with_external_context(
                 TracerEip3155::new(Box::new(std::io::stderr())).without_summary(),
             );
-        cfg_if::cfg_if! {
-            if #[cfg(feature = "l2")] {
-                use revm::{Handler, primitives::{CancunSpec, HandlerCfg}};
-                use std::sync::Arc;
-
-                evm_builder = evm_builder.with_handler({
-                    let mut evm_handler = Handler::new(HandlerCfg::new(SpecId::LATEST));
-                    evm_handler.pre_execution.deduct_caller = Arc::new(mods::deduct_caller::<CancunSpec, _, _>);
-                    evm_handler.validation.tx_against_state = Arc::new(mods::validate_tx_against_state::<CancunSpec, _, _>);
-                    // TODO: Override `end` function. We should deposit even if we revert.
-                    // evm_handler.pre_execution.end
-                    evm_handler
-                });
-            }
-        }
 
         match state {
             EvmState::Store(db) => {