linux-wandboard

sh: Make on-chip DMA channel selection explicit.

Currently this has a prompt to allow users to change it. There's
no reason to do this, and it has caused breakage and confusion
in the past, so remove it entirely.

We'll get rid of this when the whole driver is tidied for
the driver model.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>