include/devicetree: dma: cleanup params to DT_*DMAS_CELL_BY_NAME
include/devicetree: dma: cleanup params to DT_*DMAS_CELL_BY_NAME

The params in the macro's were a bit confused in what was cell_name and
what was name.  The order was correct and matched other _BY_NAME macros.
Rename the params to just 'name' and 'cell' to match other macro's and
fix any other minor issues associated with this confusion.

Signed-off-by: Kumar Gala <a5e5248af4cd4f0ed8c515f61d40a6e2db46a66e@linaro.org>

Vudentz/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,Vudentz/zephyr,galak/zephyr,Vudentz/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,Vudentz/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,nashif/zephyr,nashif/zephyr,finikorg/zephyr,nashif/zephyr,nashif/zephyr,Vudentz/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr