ASoC: es7134: remove 64kHz rate from the supported rates

64Khz is actually not supported by the es7134 according to the datasheet

Fixes: 9000b59d ("ASoC: es7134: add es7134 DAC driver")
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Mark Brown <broonie@kernel.org>