drivers: i2c_rtio: max32: Inform the rtio executor on errors

Call i2c_rtio_complete with a non-zero status code in case of an error
so that application does not get stuck waiting for the completion queue
event. An example to this situation could be an I2C target device
responding with a NACK to a read or write request by the controller.

Signed-off-by: Tahsin Mutlugun <Tahsin.Mutlugun@analog.com>