MLK-11429-20: ASoC: cs4xx8: fix the setting of Functional mode

MLK-11429-20: ASoC: cs4xx8: fix the setting of Functional mode

cherry-pick below patch from imx_3.14.y
ENGR00320849-1 ASoC: cs4xx8: fix the setting of Functional mode

Failed case:
arecord -Dhw:0,1 -f S16_LE -r 96000 -c 2 -traw | aplay -Dhw:0,0 -f
S16_LE -r 96000 -c 2 -traw.
There is no sound when use this case.The reason is that the setting
of Functional mode is not correct.

Signed-off-by: Shengjiu Wang <b02247@freescale.com>
(cherry picked from commit be1ef3bb8da5c263345ebdad4a7c218a095d0f48)
(cherry picked from commit c2dfac6c09bc1fcb044022bcdaea450707feda4c)