Updated Pin Assignments (Add SPI definition)

Changed incorrect i2C pins assignment in mpconfigboard.h (changed SDA/SCL to GPIO 8/GPIO 9. 
Rename  SD_MOSI, SD_MISO and SD_SCK to MOSI, MISO and SCK
Added SPI define in mpconfigboard.h for SPI

Author: BrainBoardz

ports/espressif/boards/brainboardz_neuron/pins.c

@@ -63,7 +63,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_IO46), MP_ROM_PTR(&pin_GPIO46) },
     { MP_ROM_QSTR(MP_QSTR_IO47), MP_ROM_PTR(&pin_GPIO47) },
     { MP_ROM_QSTR(MP_QSTR_IO48), MP_ROM_PTR(&pin_GPIO48) },
-    
+
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
 };