feat(sysreg): update handle_read and handle_write to use unused parameters

Author: luodeb

src/sysreg/cntp_tval_el0.rs

@@ -34,16 +34,16 @@ impl BaseDeviceOps<SysRegAddrRange> for SysCntpTvalEl0 {
 
     fn handle_read(
         &self,
-        addr: <SysRegAddrRange as DeviceAddrRange>::Addr,
-        width: AccessWidth,
+        _addr: <SysRegAddrRange as DeviceAddrRange>::Addr,
+        _width: AccessWidth,
     ) -> AxResult<usize> {
         todo!()
     }
 
     fn handle_write(
         &self,
         addr: <SysRegAddrRange as DeviceAddrRange>::Addr,
-        width: AccessWidth,
+        _width: AccessWidth,
         val: usize,
     ) -> AxResult {
         info!("Write to emulator register: {:?}, value: {}", addr, val);