drm/sprd: move to devm_platform_ioremap_resource() usage

drm/sprd: move to devm_platform_ioremap_resource() usage

Replace platform_get_resource + devm_ioremap
with just devm_platform_ioremap_resource()

Used Coccinelle to do this change. SmPl patch:
@rule_2@
identifier res;
expression ioremap;
identifier pdev;
@@
-struct resource *res;
...
-res = platform_get_resource(pdev,...);
<...
-if (!res) {
-...
-}
...>
-ioremap = devm_ioremap(...);
+ioremap = devm_platform_ioremap_resource(pdev,0);

v2: Address the return handling properly since
the new API returns error pointers and not NULL.

Cc: Chunyan Zhang <zhang.lyra@gmail.com>
Cc: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Anusha Srivatsa <asrivats@redhat.com>
Reviewed-by: Chunyan Zhang <zhang.lyra@gmail.com>(v1)
Reviewed-by: Maxime Ripard <mripard@kernel.org>(v1)
Link: https://patchwork.freedesktop.org/patch/640854/?series=144073&rev=5