ASoC: ti: davinci-i2s: Delete unnecessary assignment

In davinci_i2s_hw_params(), mcbsp_word_length is set twice to
asp_word_length[fmt].

Remove second unnecessary assignment.

Signed-off-by: Bastien Curutchet <bastien.curutchet@bootlin.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@gmail.com>
Link: https://msgid.link/r/20240402071213.11671-7-bastien.curutchet@bootlin.com
Signed-off-by: Mark Brown <broonie@kernel.org>