drivers: dma: Add dma driver for Nios-II MSGDMA core

Add dma driver for Nios-II Modular Scatter-Gather DMA soft IP.

This driver relies upon the Altera HAL msgdma driver for all
the dma core register programming and interrupt handling.

Signed-off-by: Ramakrishna Pallala <ramakrishna.pallala@intel.com>