libcamera: Declare empty virtual destructors as defaulted

The base class of polymorphic classes is required to declare a
destructor. Several of these are empty, and can thus be declared as
defaulted.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Umang Jain <email@uajain.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/ipa/raspberrypi/md_parser.hpp

@@ -67,7 +67,7 @@ public:
 		ERROR = 2
 	};
 	MdParser() : reset_(true) {}
-	virtual ~MdParser() {}
+	virtual ~MdParser() = default;
 	void Reset() { reset_ = true; }
 	void SetBitsPerPixel(int bpp) { bits_per_pixel_ = bpp; }
 	void SetNumLines(unsigned int num_lines) { num_lines_ = num_lines; }