serial: stm32: Use TC interrupt to deassert GPIO RTS in RS485 mode

In case the RS485 mode is emulated using GPIO RTS, use the TC interrupt
to deassert the GPIO RTS, otherwise the GPIO RTS stays asserted after a
transmission ended and the RS485 cannot work.

Signed-off-by: Marek Vasut <[email protected]>
Cc: Alexandre Torgue <[email protected]>
Cc: Erwan Le Ray <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Jean Philippe Romain <[email protected]>
Cc: Valentin Caron <[email protected]>
Cc: [email protected]
Cc: [email protected]
To: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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