fix(uart): returns success on baud rate change operation

Author: SuGlider

cores/esp32/esp32-hal-uart.h

@@ -58,7 +58,7 @@ void uartWriteBuf(uart_t *uart, const uint8_t *data, size_t len);
 void uartFlush(uart_t *uart);
 void uartFlushTxOnly(uart_t *uart, bool txOnly);
 
-void uartSetBaudRate(uart_t *uart, uint32_t baud_rate);
+bool uartSetBaudRate(uart_t *uart, uint32_t baud_rate);
 uint32_t uartGetBaudRate(uart_t *uart);
 
 void uartSetRxInvert(uart_t *uart, bool invert);