[Backport v4.0-branch] drivers: uart: esp32: reset tx fifo during driver init #82983
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Resets uart tx fifo during driver initialization to have a well defined initial condition mainly preventing unwanted characters being sent Signed-off-by: Marcio Ribeiro <[email protected]> (cherry picked from commit f0516ea)
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Backport f0516ea from #82967.
Fixes #82370