drivers: i2c: i2c_nrfx_twim: fail gracefully on dma max size

Different nRF52 devices have different maximum TWI DMA transfer size,
and it's easy to hit the limit with i2c displays on nrf52832 (8 bit) and
nrf52810 (10 bit). Currently neither the driver or the hal validate the
limit, leading to random NACK errors when trying to transfer more data.

Add a check on the driver to fail gracefully when going over the limit.

Signed-off-by: Fabio Baltieri <fabiobaltieri@google.com>