android: Set result metadata and EXIF fields based on request metadata

Set the following android result metadata:
- ANDROID_LENS_FOCAL_LENGTH
- ANDROID_LENS_APERTURE
- ANDROID_JPEG_GPS_TIMESTAMP
- ANDROID_JPEG_GPS_COORDINATES
- ANDROID_JPEG_GPS_PROCESSING_METHOD

And the following EXIF fields:
- GPSDatestamp
- GPSTimestamp
- GPSLocation
  - GPSLatitudeRef
  - GPSLatitude
  - GPSLongitudeRef
  - GPSLongitude
  - GPSAltitudeRef
  - GPSAltitude
- GPSProcessingMethod
- FocalLength
- ExposureTime
- FNumber
- ISO
- Flash
- WhiteBalance
- SubsecTime
- SubsecTimeOriginal
- SubsecTimeDigitized

Based on android request metadata.

This allows the following CTS tests to pass:
- android.hardware.camera2.cts.StillCaptureTest#testFocalLengths
- android.hardware.camera2.cts.StillCaptureTest#testJpegExif

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

src/android/camera_stream.cpp

@@ -96,12 +96,15 @@ int CameraStream::configure()
 }
 
 int CameraStream::process(const libcamera::FrameBuffer &source,
-			  MappedCamera3Buffer *dest, CameraMetadata *metadata)
+			  MappedCamera3Buffer *dest,
+			  const CameraMetadata &requestMetadata,
+			  CameraMetadata *resultMetadata)
 {
 	if (!postProcessor_)
 		return 0;
 
-	return postProcessor_->process(source, dest->maps()[0], metadata);
+	return postProcessor_->process(source, dest->maps()[0],
+				       requestMetadata, resultMetadata);
 }
 
 FrameBuffer *CameraStream::getBuffer()