ASoC: Manage mode and rate bits correctly for CS4271 CODEC.

Manage mode and rate bits correctly, according to datasheet in CS4271 CODEC.
This is done to make capture work properly.

Signed-off-by: Alexander Sverdlin <subaparts@yandex.ru>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>