memory: tegra: Extract setup code into callback

Separate the setup code for Tegra30 and later into a ->setup() callback
and set it for all applicable chips.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20210602163302.120041-7-thierry.reding@gmail.com


Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>