media: atmel: atmel-isc: Use devm_platform_ioremap_resource()

According to commit 7945f929 ("drivers: provide
devm_platform_ioremap_resource()"), convert platform_get_resource(),
devm_ioremap_resource() to a single call to use
devm_platform_ioremap_resource(), as this is exactly what this function
does.

Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>