dmaengine: tegra: Move of_device_id table near to its user

After using the function of_device_get_match_data(), the
of_device_id table for tegra20 dma is not used by probe()
and hence moving it near to place where platform driver is
defined as this table used only on this data structure.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>