refactor: Drop FsFile alias, use HalFile in downstream code (#2141)

lib/hal/HalStorage.cpp

@@ -1,4 +1,3 @@
-#define HAL_STORAGE_IMPL
 #include "HalStorage.h"
 
 #include <FS.h>  // need to be included before SdFat.h for compatibility with FS.h's File class

lib/hal/HalStorage.h

@@ -96,13 +96,6 @@ class HalFile : public Print {
   operator bool() const;
 };
 
-// Only do renaming FsFile to HalFile if this header is included by downstream code
-// The renaming is to allow using the thread-safe HalFile instead of the raw FsFile, without needing to change the
-// downstream code
-#ifndef HAL_STORAGE_IMPL
-using FsFile = HalFile;
-#endif
-
 // Downstream code must use Storage instead of SdMan
 #ifdef SdMan
 #undef SdMan