commit 3c1dae0a upstream.

The DPAUX read/write FIFO registers aren't sequential in the register
space, causing transfers larger than 4 bytes to cause accesses to non-
existing FIFO registers.

Fixes: 6b6b6042 ("drm/tegra: Add eDP support")
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>