stm32/main: Call sdcard_init when only MICROPY_HW_ENABLE_MMCARD enabled.

Otherwise, if MMCARD is enabled and not SDCARD, then the GPIO will not be
configured for SDIO.
Signed-off-by: Damien George <damien@micropython.org>

ports/stm32/main.c

@@ -419,7 +419,7 @@ void stm32_main(uint32_t reset_mode) {
     #if MICROPY_PY_PYB_LEGACY && MICROPY_HW_ENABLE_HW_I2C
     i2c_init0();
     #endif
-    #if MICROPY_HW_ENABLE_SDCARD
+    #if MICROPY_HW_ENABLE_SDCARD || MICROPY_HW_ENABLE_MMCARD
     sdcard_init();
     #endif
     #if MICROPY_HW_ENABLE_STORAGE