misc: pvpanic: Use devm_platform_ioremap_resource()

Make use of devm_platform_ioremap_resource() provided by driver
core platform instead of duplicated analogue.

Acked-by: Arnd Bergmann <arn@arndb.de>
Signed-off-by: Wang ShaoBo <bobo.shaobowang@huawei.com>
Link: https://lore.kernel.org/r/20200918083634.33124-1-bobo.shaobowang@huawei.com


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