build: clean up the mess of ifdefs from platform into a scons-configured hal

src/FsUtils.cpp

@@ -6,10 +6,10 @@ filename_iterator::filename_iterator()
 {}
 
 filename_iterator::filename_iterator(const char* path, const char* suffix)
-#ifdef BOARD_ESP8266
+#ifdef ESP8266
   : dir(LittleFS.openDir(path)),
 #endif
-#ifdef BOARD_ESP32
+#ifdef ESP32
   : dir(LittleFS.open(path)),
 #endif
     valid(true),
@@ -26,7 +26,7 @@ filename_iterator::next()
   }
   int extPos = -1;
   do {
-#ifdef BOARD_ESP8266
+#ifdef ESP8266
     valid = dir.next();
     if (valid) {
       String fname = dir.fileName();
@@ -36,7 +36,7 @@ filename_iterator::next()
       }
     }
 #endif
-#ifdef BOARD_ESP32
+#ifdef ESP32
     File next = dir.openNextFile();
     valid = (bool)next;
     if (valid && !next.isDirectory()) {