Use devm_platform_ioremap_resource() to simplify the code a bit.
This is detected by coccinelle.

Link: https://lore.kernel.org/r/20190904130348.24772-1-yuehaibing@huawei.comReported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>