samples: hci_uart: fix UART IRQ API usage #82797
Merged
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uart_irq_update() should always be called in IRQ processing callback. From API documentation:
"This function should be called the first thing in the ISR. Calling uart_irq_rx_ready(), uart_irq_tx_ready(), uart_irq_tx_complete() allowed only after this."
chery-picked from #80985