ipa: rpi: Add erase()/eraseLocked() to RPiController::Metadata

These functions erase a key/value pair from the metadata object.

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/ipa/rpi/controller/metadata.h

@@ -91,6 +91,12 @@ public:
 		data_.insert(other.data_.begin(), other.data_.end());
 	}
 
+	void erase(std::string const &tag)
+	{
+		std::scoped_lock lock(mutex_);
+		eraseLocked(tag);
+	}
+
 	template<typename T>
 	T *getLocked(std::string const &tag)
 	{
@@ -111,6 +117,14 @@ public:
 		data_[tag] = std::forward<T>(value);
 	}
 
+	void eraseLocked(std::string const &tag)
+	{
+		auto it = data_.find(tag);
+		if (it == data_.end())
+			return;
+		data_.erase(it);
+	}
+
 	/*
 	 * Note: use of (lowercase) lock and unlock means you can create scoped
 	 * locks with the standard lock classes.