libcamera: pixel_format: Add a function to return format based on string

Add a function which retrieves pixel format corresponding to its name
from PixelFormatInfo.

Signed-off-by: Kaaira Gupta <kgupta@es.iitr.ac.in>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

include/libcamera/pixel_format.h

@@ -38,6 +38,8 @@ public:
 
 	std::string toString() const;
 
+	static PixelFormat fromString(const std::string &name);
+
 private:
 	uint32_t fourcc_;
 	uint64_t modifier_;