spi: npcm-pspi: fix 16 bit send and receive support

Fixing NPCM BMC Peripheral SPI controller 16 bit
send and receive support by writing and reading
the SPI data in the right order.

Signed-off-by: Tomer Maimon <tmaimon77@gmail.com>
Link: https://lore.kernel.org/r/20200115162301.235926-2-tmaimon77@gmail.com


Signed-off-by: Mark Brown <broonie@kernel.org>