Documentation: devres: add missing entry for devm_platform_get_and_ioremap_resource()

The devm_platform_get_and_ioremap_resource() should be documented in
devres.rst. Add the missing entry.

Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com>
Link: https://lore.kernel.org/r/20200527144531.9376-1-zhengdejin5@gmail.com


Signed-off-by: Jonathan Corbet <corbet@lwn.net>