extmod/fsusermount: Make configurable with MICROPY_FSUSERMOUNT.
diff --git a/py/mpconfig.h b/py/mpconfig.h
index 1453560..686f90c 100644
--- a/py/mpconfig.h
+++ b/py/mpconfig.h
@@ -469,6 +469,11 @@
 #define MICROPY_BUILTIN_METHOD_CHECK_SELF_ARG (1)
 #endif
 
+// Support for user-space VFS mount (selected ports)
+#ifndef MICROPY_FSUSERMOUNT
+#define MICROPY_FSUSERMOUNT (0)
+#endif
+
 /*****************************************************************************/
 /* Fine control over Python builtins, classes, modules, etc                  */