tty: serial: clean up stop-tx part in altera_uart_tx_chars()

The "stop TX" path in altera_uart_tx_chars() is open-coded, so:
* use uart_circ_empty() to check if the buffer is empty, and
* when true, call altera_uart_stop_tx().

Cc: Tobias Klauser <[email protected]>
Reviewed-by: Ilpo Järvinen <[email protected]>
Acked-by: Tobias Klauser <[email protected]>
Signed-off-by: Jiri Slaby <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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