controls: Add boolean constructors for ControlInfo

It would be convenient to be able to iterate over available boolean
values, for example for controls that designate if some function can be
enabled/disabled. The current min/max/def constructor is insufficient,
as .values() is empty, so the values cannot be easily iterated over, and
creating a Span of booleans does not work for the values constructor.

Add new constructors to ControlInfo that takes a set of booleans (if
both booleans are valid values) plus a default, and another that takes
only one boolean (if only one boolean is a valid value).

Update the ControlInfo test accordingly.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>

include/libcamera/controls.h

@@ -9,6 +9,7 @@
 #define __LIBCAMERA_CONTROLS_H__
 
 #include <assert.h>
+#include <set>
 #include <stdint.h>
 #include <string>
 #include <unordered_map>
@@ -272,6 +273,8 @@ public:
 			     const ControlValue &def = 0);
 	explicit ControlInfo(Span<const ControlValue> values,
 			     const ControlValue &def = {});
+	explicit ControlInfo(std::set<bool> values, bool def);
+	explicit ControlInfo(bool value);
 
 	const ControlValue &min() const { return min_; }
 	const ControlValue &max() const { return max_; }