driver core: platform: Reimplement devm_platform_ioremap_resource

Reimplement devm_platform_ioremap_resource() by calling
devm_platform_ioremap_and_get_resource() with res = NULL to
simplify the code.

Suggested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com>
Link: https://lore.kernel.org/r/20200323160612.17277-6-zhengdejin5@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>