memory: mtk-smi: Use devm_platform_ioremap_resource

No functional change. Simplify probing code.

Signed-off-by: Yong Wu <yong.wu@mediatek.com>
Reviewed-by: Ikjoon Jang <ikjn@chromium.org>
Link: https://lore.kernel.org/r/20210914113703.31466-10-yong.wu@mediatek.com


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