qemu/mpconfigport: Enable VFS reader, loading .mpy files and io.IOBase.

This allows importing from the VFS, and enables the following 7 additional
tests: builtin_execfile, io_iobase, json_dump_iobase, import_mpy_invalid,
import_mpy_native, import_mpy_native_gc, vfs_userfs.

Signed-off-by: Damien George <[email protected]>

Author: dpgeorge

ports/qemu/main.c

@@ -71,10 +71,6 @@ void gc_collect(void) {
     gc_collect_end();
 }
 
-mp_lexer_t *mp_lexer_new_from_file(qstr filename) {
-    mp_raise_OSError(MP_ENOENT);
-}
-
 void nlr_jump_fail(void *val) {
     mp_printf(&mp_plat_print, "uncaught NLR\n");
     exit(1);

ports/qemu/mpconfigport.h

@@ -42,13 +42,14 @@
 #endif
 
 #define MICROPY_MALLOC_USES_ALLOCATED_SIZE (1)
+#define MICROPY_PERSISTENT_CODE_LOAD (1)
 #define MICROPY_MEM_STATS           (1)
+#define MICROPY_READER_VFS          (1)
 #define MICROPY_ENABLE_GC           (1)
 #define MICROPY_ENABLE_EMERGENCY_EXCEPTION_BUF (1)
 #define MICROPY_LONGINT_IMPL        (MICROPY_LONGINT_IMPL_MPZ)
 #define MICROPY_FLOAT_IMPL          (MICROPY_FLOAT_IMPL_FLOAT)
 #define MICROPY_WARNINGS            (1)
-#define MICROPY_PY_IO_IOBASE        (0)
 #define MICROPY_PY_SYS_PLATFORM     "qemu"
 #define MICROPY_PY_SYS_STDIO_BUFFER (0)
 #define MICROPY_PY_SELECT           (0)