remove HAL implementation files for v3 and v4, and the build script

Software/MainBoard/rust/src/hal/little_fs2storage_adapter.rs

@@ -63,25 +63,25 @@ impl lfs2Storage for LittleFs2Filesystem {
         let block_size: usize = Self::BLOCK_SIZE;
         if off % block_size != 0 {
             error!("Littlefs2Filesystem erase error: offset not aligned to block size offset: {off} block_size: {block_size}");
-            return lfs2Result::Err(lfs2Error::IO);
+            return Err(lfs2Error::IO);
         }
         if len % block_size != 0 {
             error!("Littlefs2Filesystem erase error: length not aligned to block size length: {len} block_size: {block_size}");
-            return lfs2Result::Err(lfs2Error::IO);
+            return Err(lfs2Error::IO);
         }
 
         match check_erase(self.storage, off as u32, (off + len) as u32) {
             Ok(_) => {}
             Err(err) => {
                 error!("Littlefs2Filesystem check erase error: {err:?}");
-                return lfs2Result::Err(lfs2Error::IO);
+                return Err(lfs2Error::IO);
             }
         }
         match self.storage.erase(off as u32, (off + len) as u32) {
-            Ok(..) => lfs2Result::Ok(len),
+            Ok(..) => Ok(len),
             Err(err) => {
                 error!("Littlefs2Filesystem erase error: {err:?}");
-                lfs2Result::Err(lfs2Error::IO)
+                Err(lfs2Error::IO)
             }
         }
     }