uart: set RX line pull mode in accordance with its inverse mode
uart: set RX line pull mode in accordance with its inverse mode

Set RX line pull mode in accordance with its inverse mode
 - set PULL DOWN if RX is in inversed mode
 - set PULL UP otherwise

Signed-off-by: Ilya Ledvich <b08ef455f59ee6068c026584c30c166e0dc8e917@kwik.me>

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