memory: tegra: Use devm_platform_ioremap_resource()

Use devm_platform_ioremap_resource() helper which makes code a bit
cleaner.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20201104164923.21238-30-digetx@gmail.com


Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>