esp32/modules: Create ffat partition object with block_size=512.

Because these are formatted with a 512 sector size.

Signed-off-by: Damien George <damien@micropython.org>

ports/esp32/modules/flashbdev.py

@@ -3,5 +3,5 @@ from esp32 import Partition
 # MicroPython's partition table uses "vfs", TinyUF2 uses "ffat".
 bdev = Partition.find(Partition.TYPE_DATA, label="vfs")
 if not bdev:
-    bdev = Partition.find(Partition.TYPE_DATA, label="ffat")
+    bdev = Partition.find(Partition.TYPE_DATA, label="ffat", block_size=512)
 bdev = bdev[0] if bdev else None