ports/esp32/machine_sdcard.c: CLK, CMD and D0 custom pins in SD/MMC.

Signed-off-by: Josep Comas <jcomas@gmail.com>

ports/esp32/machine_sdcard.c

@@ -298,9 +298,11 @@ STATIC mp_obj_t machine_sdcard_make_new(const mp_obj_type_t *type, size_t n_args
         // it is a good idea to set the internal pull-ups anyway.
         // slot_config.flags = SDMMC_SLOT_FLAG_INTERNAL_PULLUP;
 
+        #if CONFIG_IDF_TARGET_ESP32
         SET_CONFIG_PIN(slot_config, clk, ARG_sck);
         SET_CONFIG_PIN(slot_config, cmd, ARG_mosi);
         SET_CONFIG_PIN(slot_config, d0, ARG_miso);
+        #endif
 
         SET_CONFIG_PIN(slot_config, gpio_cd, ARG_cd);
         SET_CONFIG_PIN(slot_config, gpio_wp, ARG_wp);