drivers: i2c_nrfx_twi: Add recover when I2C transfer timeout

Previously to this commit, nothing was done to restore the bus to an
healthy level.
However, I2C devices sometimes needs help to recover from an aborted
transaction.
Therefore, we now add a call to nrfx_{twi, twim}_bus_recover().

Signed-off-by: Xavier Chapron <xavier.chapron@stimio.fr>