cleanup mrsigner from hex

src/main.rs

@@ -2,7 +2,6 @@ mod datastore;
 mod grpc;
 mod http_server;
 mod persistence;
-mod sgx;
 mod solana;
 
 use crate::{

src/sgx.rs

@@ -1,6 +0,0 @@
-// TODO: Use error types (define error types in error.rs, see occlum-ratls as an example)
-pub fn mrsigner_from_hex(mrsigner_hex: &str) -> Result<[u8; 32], Box<dyn std::error::Error>> {
-    let mut mrsigner = [0u8; 32];
-    hex::decode_to_slice(mrsigner_hex, &mut mrsigner)?;
-    Ok(mrsigner)
-}