dma: tegra: add support for Tegra148/124
Tegra148 introduces a few changes to the APB DMA HW registers. Update the driver to cope with them. Tegra124 inherits these changes. * The register address stride between DMA channels increases. * A new per-channel WCOUNT register is introduced. Signed-off-by: NLaxman Dewangan <ldewangan@nvidia.com> Signed-off-by: NKunal Agrawal <kunala@nvidia.com> [swarren, remove .dts file change, rewrote commit description, removed some duplicate/unused code and register IO] Signed-off-by: NStephen Warren <swarren@nvidia.com> Reviewed-by: NThierry Reding <treding@nvidia.com> Tested-by: NThierry Reding <treding@nvidia.com> Signed-off-by: NVinod Koul <vinod.koul@intel.com>
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