fix(esp32_p4_function_ev_board): use slot 0 for SD card #405
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SD card on P4 EV board is connected to slot 0. Previously the code used slot 1 and routed it through GPIO Matrix to slot 0 pins. This resulted in conflicts when trying to use slot 1 for connecting to ESP32-C6 over SDIO.
See espressif/esp-idf#14699 (comment) for background.