hw/drivers: Lack of simple UART string transmit API

[wiktorkwiatkowski]

Currently, there is no easy way to send a full string over a UART interface.
You have to send each character manually, like this:

char *str = "Hello World!";
char *ptr = str;

while (*ptr) {
    hal_uart_blocking_tx(MY_UART, *ptr++);
}
hal_uart_blocking_tx(MY_UART, '\n');

For the console, there is console_printf(), but there isnt similar function for general UARTs.

Proposal:
Add function, for example:
void hal_uart_transmit(int uart, char *str);
that would send the whole string over the selected UART.

Example usage:
hal_uart_transmit(1, "Hello World!\n");

[spnirmal]

can this be assigned to me.