DMAENGINE: extend the control command to include an arg

This adds an argument to the DMAengine control function, so that
we can later provide control commands that need some external data
passed in through an argument akin to the ioctl() operation
prototype.

[[email protected]: fix up some missed conversions]
Signed-off-by: Linus Walleij <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
14 files changed