refactor: sync from template - ENABLE/DISABLE macro pattern

- board_config.h: replace #define/#undef with ENABLE/DISABLE constants
- All debug switches use ENABLE/DISABLE instead of define/undef
- Replace #ifdef with #if MACRO == ENABLE across all sources
- Sync updated README documentation

Inc/i2c.h

@@ -86,7 +86,9 @@ i2c_result_t i2c_bus_reset(void);
     \param[out] none
     \retval     none
 */
+#if DEBUG_VERBOSE == ENABLE
 void i2c_scan(void);
+#endif
 
 /*!
     \brief      write 16-bit data to I2C device
@@ -139,7 +141,7 @@ i2c_result_t i2c_read(uint8_t slave_addr, uint8_t reg_addr, uint8_t *data, uint8
 */
 i2c_result_t i2c_read_raw(uint8_t slave_addr, uint8_t *data, uint8_t length);
 
-#ifdef DEBUG_VERBOSE
+#if DEBUG_VERBOSE == ENABLE
 /*!
     \brief      get status string for debugging
     \param[in]  status: i2c_result_t value