dmaengine: tegra: add slave capabilities reporting

After commit ecc19d17 ("dmaengine: Add
a warning for drivers not using the generic slave caps retrieval"),
the Tegra APB DMA driver causes this warning during boot:

WARNING: CPU: 0 PID: 1 at drivers/dma/dmaengine.c:830 dma_async_device_register+0x294/0x538()
this driver doesn't support generic slave capabilities reporting

Fix by setting the appropriate reporting structure fields that are
passed to dma_async_device_register().

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>