ARM: tegra: Add Tegra124 host1x support

The version of host1x on Tegra124 is largely compatible with that on
earlier Tegra generations. Some of the registers have moved around or
expanded to allow for more capability, so a separate compatible string
is still required.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>