libcamera: bayer_format: Add operator<<()

Implement the stream output operator<<() for the BayerFormat class to
simplify printing them.

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

include/libcamera/internal/bayer_format.h

@@ -7,6 +7,7 @@
 
 #pragma once
 
+#include <ostream>
 #include <stdint.h>
 #include <string>
 
@@ -68,4 +69,6 @@ static inline bool operator!=(const BayerFormat &lhs, const BayerFormat &rhs)
 	return !(lhs == rhs);
 }
 
+std::ostream &operator<<(std::ostream &out, const BayerFormat &f);
+
 } /* namespace libcamera */