esp32: Enable VfsMap.

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

ports/esp32/modules/_boot.py

@@ -1,7 +1,14 @@
 import gc
 import vfs
+from esp32 import Partition
 from flashbdev import bdev
 
+if mapfs := Partition.find(Partition.TYPE_DATA, label="mapfs"):
+    import sys
+
+    sys.path.insert(0, "/mapfs")
+del mapfs
+
 try:
     if bdev:
         vfs.mount(bdev, "/")

ports/esp32/mpconfigport.h

@@ -71,6 +71,7 @@
 #define MICROPY_USE_INTERNAL_PRINTF         (0) // ESP32 SDK requires its own printf
 #define MICROPY_SCHEDULER_DEPTH             (8)
 #define MICROPY_VFS                         (1)
+#define MICROPY_VFS_MAP                     (1)
 
 // control over Python builtins
 #define MICROPY_PY_STR_BYTES_CMP_WARN       (1)