libcamera: controls: Add support for byte controls

Add support for byte values to the control framework and to the control
serializer.

Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

include/libcamera/controls.h

@@ -22,6 +22,7 @@ class ControlValidator;
 enum ControlType {
 	ControlTypeNone,
 	ControlTypeBool,
+	ControlTypeByte,
 	ControlTypeInteger32,
 	ControlTypeInteger64,
 	ControlTypeFloat,
@@ -43,6 +44,11 @@ struct control_type<bool> {
 	static constexpr ControlType value = ControlTypeBool;
 };
 
+template<>
+struct control_type<uint8_t> {
+	static constexpr ControlType value = ControlTypeByte;
+};
+
 template<>
 struct control_type<int32_t> {
 	static constexpr ControlType value = ControlTypeInteger32;