linux-wandboard

ENGR00212318 ASRC:update to in/out width config

The origin ASRC driver did not support input and output wordwidth
config but an total wordwidth config instead. And the input wordwith
and output wordwidth are all fixed to 24 bit.

In this path, we do things below:

1 Update to use input wordwidth and output wordwidth config seperately
 instead of an total wordwidth config.
2 Set corresponding DMA(input/output) buswidth according ASRC's input
and output wordwidth config.
3 Support 16/24 bit input wordwidth and 24 bit output wordwidth.

Signed-off-by: Chen Liangjun <b36089@freescale.com>