graphics: write small GPU-written tiled images back to guest memory behind --readback-tiled-images

Co-authored-by: Dimitar Vagalinski <275970482+overlordxrz-source@users.noreply.github.com>
Co-authored-by: Mr. Big Britches <111622360+MrBigBritches@users.noreply.github.com>

src/common/emulatorConfig.cpp

@@ -185,6 +185,10 @@ bool ReadbackLinearImagesEnabled() {
 	return g_config->readback_linear_images;
 }
 
+bool ReadbackTiledImagesEnabled() {
+	return g_config->readback_tiled_images;
+}
+
 bool SyncRawImageBuffersEnabled() {
 	return g_config->sync_raw_image_buffers;
 }