resource: Add a resource_list_first_type helper

A common pattern is looping over a resource_list just to get a matching
entry with a specific type. Add resource_list_first_type() helper which
implements this.
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>

include/linux/resource_ext.h

@@ -66,4 +66,16 @@ resource_list_destroy_entry(struct resource_entry *entry)
 #define resource_list_for_each_entry_safe(entry, tmp, list)	\
 	list_for_each_entry_safe((entry), (tmp), (list), node)
 
+static inline struct resource_entry *
+resource_list_first_type(struct list_head *list, unsigned long type)
+{
+	struct resource_entry *entry;
+
+	resource_list_for_each_entry(entry, list) {
+		if (resource_type(entry->res) == type)
+			return entry;
+	}
+	return NULL;
+}
+
 #endif /* _LINUX_RESOURCE_EXT_H */