1. add uart.h and uart.c 2. add ESP_ERR_TIMEOUT in esp_err.h 3. add UART AHB FIFO address in uart_reg.h 4. modify xRingbufferSendFromISR return value in ringbuffer.c 5. add #include "soc/gpio_sig_map.h" in gpio.h
Pass compiling under esp-idf-tests/merge_soc_tmp/merge_for_soc_headers branch.(only change some names of register and INUM).