ASoC: fsl_esai: Fix incorrect xDC field width of xCCR registers

The xDC field should have 5 bit width according to Reference Manual.
Thus this patch fixes it.

Signed-off-by: Aurelien BOUIN <a_bouin@yahoo.fr>
Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org