Fix style issues in spi-eeprom.c/h

stm-firmware/include/reflow-controller/settings/spi-eeprom.h

@@ -28,12 +28,12 @@
  * @brief Initialize the SPI for the eeprom.
  * @return 0 if succesful
  */
-int spi_eeprom_init();
+int spi_eeprom_init(void);
 
 /**
  * @brief Uninitialize the SPI EEPROM
  */
-void spi_eeprom_deinit();
+void spi_eeprom_deinit(void);
 
 /**
  * @brief Read from SPI EEPROM