[nrf fromtree] drivers: serial: nrfx_uarte: Add support for variable frame size#3906
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…frame size nRF54x devices supports 4-9 bit frame size. Extend UART driver to support data sizes supported by the Zephyr UART API (5-9 bits). Signed-off-by: Krzysztof Chruściński <krzysztof.chruscinski@nordicsemi.no> (cherry picked from commit 67f1cee)
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Add various frame sizes in UART driver. Extend
uart_async_apitest to check those frame sizes.