dmaengine: dw: Make it dependent to HAS_IOMEM

Some architectures do not provide devm_*() APIs. Hence make the driver
dependent on HAVE_IOMEM.

Fixes: dbde5c29

 ("dw_dmac: use devm_* functions to simplify code")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Link: https://lore.kernel.org/r/20210324141757.24710-1-andriy.shevchenko@linux.intel.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>