Use the devm_platform_get_and_ioremap_resource to simplify the code
a bit.
Signed-off-by: Jay Chen <jkchen@linux.alibaba.com>
Link: https://lore.kernel.org/r/20200706112246.92220-2-jkchen@linux.alibaba.comSigned-off-by: Will Deacon <will@kernel.org>