iommu/arm-smmu: Use Tegra implementation on Tegra186

Tegra186 requires the same SID override programming as Tegra194 in order
to seamlessly transition from the firmware framebuffer to the Linux
framebuffer, so the Tegra implementation needs to be used on Tegra186
devices as well.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20210603164632.1000458-7-thierry.reding@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>