Enable the Command Queue if the host controller supports a command queue
engine. It is not compatible with Packed Commands, so make a note of that in the
comment.
Signed-off-by: NAdrian Hunter <adrian.hunter@intel.com>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>