drivers: serial: uart_async_to_irq: Fix uart_irq_tx_complete
uart_irq_tx_complete is implemented by z_uart_async_to_irq_irq_tx_ready which changed recently (5bd53b6e) to return positive value that may be bigger than 1. uart_irq_tx_complete shall not return value bigger than 1. Signed-off-by:Krzysztof Chruściński <krzysztof.chruscinski@nordicsemi.no>
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