Moved simultaneous reading and writing into SPI; removed it from I2C and UART

include/sta/bus/interface.hpp

@@ -35,14 +35,6 @@ namespace sta
          * @param size      Number of bytes to transfer
          */
         virtual void transfer(const uint8_t * buffer, size_t size) = 0;
-        /**
-         * @brief Send and receive data simultaneously.
-         *
-         * @param txBuffer  Send buffer
-         * @param rxBuffer  Receive buffer
-         * @param size      Number of bytes to transfer
-         */
-        virtual void transfer(const uint8_t * txBuffer, uint8_t * rxBuffer, size_t size) = 0;
         /**
          * @brief Read incoming data to buffer.
          *