ASoC: dwc: Remove check in set_bclk_ratio handling

A check added to dw_i2s_set_bclk_ratio that the data format is
consistent with the ratio seems reasonable but breaks when the
ratio is changed before the format. Remove the check - it is
unnecessary.

See: https://github.com/raspberrypi/linux/issues/5724
Fixes: 9c6694c2

 ("ASOC: dwc: Fix 16-bit audio handling")

Signed-off-by: Phil Elwell <phil@raspberrypi.com>