Add functions for device configuration. The info_get function is included
here since it can be useful for checking successful configuration.

Signed-off-by: Bruce Richardson <bruce.richard...@intel.com>
Signed-off-by: Kevin Laatz <kevin.la...@intel.com>

<snip>

+The following code shows how the device is configured in
+``test_dmadev.c``:
+
+.. literalinclude:: ../../../app/test/test_dmadev.c
+   :language: c
+   :start-after: Setup of the dmadev device. 8<
+   :end-before: >8 End of setup of the dmadev device.
+   :dedent: 1
+
+Once configured, the device can then be made ready for use by calling the
+``rte_dmadev_start()`` API.

Last line should be in the next patch, but it doesn't really matter.

Reviewed-by: Conor Walsh <conor.wa...@intel.com>

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