drm/tegra: Fixes for v5.5-rc1

This is a set of small fixes, mostly for regressions introduced with the
DMA API and DisplayPort support in the main pull request for v5.5-rc1.
-----BEGIN PGP SIGNATURE-----
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=3LYB
-----END PGP SIGNATURE-----