There is a constraint for the channel number setting on the
asrc of older version (e.g. imx35), the channel number should
be even, odd number isn't valid.

So add this constraint when the asrc of older version is used.
Acked-by: NNicolin Chen <nicoleotsuka@gmail.com>
Signed-off-by: NShengjiu Wang <shengjiu.wang@nxp.com>
Signed-off-by: NMark Brown <broonie@kernel.org>