kernel/resource: simplify API __devm_release_region() implementation

Simplify __devm_release_region() implementation by dedicated API
devres_release() which have below advantages than current
__release_region() + devres_destroy():

It is simpler if __devm_release_region() is undoing what
__devm_request_region() did, otherwise, it can avoid wrong and undesired
__release_region().

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Zijun Hu <[email protected]>
Cc: Andy Shevchenko <[email protected]>
Cc: Bjorn Helgaas <[email protected]>
Cc: Ilpo Järvinen <[email protected]>
Cc: Mika Westerberg <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: zijun-hu

kernel/resource.c

@@ -1683,8 +1683,7 @@ void __devm_release_region(struct device *dev, struct resource *parent,
 {
 	struct region_devres match_data = { parent, start, n };
 
-	__release_region(parent, start, n);
-	WARN_ON(devres_destroy(dev, devm_region_release, devm_region_match,
+	WARN_ON(devres_release(dev, devm_region_release, devm_region_match,
 			       &match_data));
 }
 EXPORT_SYMBOL(__devm_release_region);