PCI: rcar-gen2: Use devm_platform_get_and_ioremap_resource()

PCI: rcar-gen2: Use devm_platform_get_and_ioremap_resource()

Convert calls to platform_get_resource() and devm_ioremap_resource()
into a single call to devm_platform_get_and_ioremap_resource(), to
simplify the code.

This new helper added in commit 890cc39a8799 ("drivers: provide
devm_platform_get_and_ioremap_resource()") does what both of the
other separate functions do.

[kwilczynski: commit log]
Link: https://lore.kernel.org/linux-pci/20230323091644.91981-1-yang.lee@linux.alibaba.com
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>