sdcardio: Don't require reaching idle state during early init

.. which is what the addition of cmd25 made happen. We still signal
an error when failing to reach the idle state at any other time,
which _is_ different than adafruit_sdcard but I think that it is
correct.

This fixed #5600 according to Dan's testing on a GCM4 on the internal
SD card slot. There are still some ambiguous results on the MM4 with
external SD card slot on 6" jumper wires.

Author: jepler

shared-module/sdcardio/SDCard.c

@@ -230,11 +230,18 @@ STATIC const compressed_string_t *init_card(sdcardio_sdcard_obj_t *self) {
 
     common_hal_digitalio_digitalinout_set_value(&self->cs, false);
 
+    assert(!self->in_cmd25);
+    self->in_cmd25 = false; // should be false already
+
     // CMD0: init card: should return _R1_IDLE_STATE (allow 5 attempts)
     {
         bool reached_idle_state = false;
         for (int i = 0; i < 5; i++) {
-            if (cmd(self, 0, 0, NULL, 0, true, true) == R1_IDLE_STATE) {
+            // do not call cmd with wait=true, because that will return
+            // prematurely if the idle state is not reached. we can't depend on
+            // this when the card is not yet in SPI mode
+            (void)wait_for_ready(self);
+            if (cmd(self, 0, 0, NULL, 0, true, false) == R1_IDLE_STATE) {
                 reached_idle_state = true;
                 break;
             }