mmc: sh_mmcif: Factorize DMA channel request and configuration code

The channel request and configuration code is duplicated for the rx and
tx channels. Create a function that requests a single channel and call
it twice instead.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
1 file changed