[zedboot][zero-state] Send zircon-r as boot kernel.

Change-Id: I27561c0be8fdca28b8d0ee99a668ee27a881138d
diff --git a/botanist/boot.go b/botanist/boot.go
index a68cfd3..0e0ff1a 100644
--- a/botanist/boot.go
+++ b/botanist/boot.go
@@ -185,7 +185,7 @@
 	}
 
 	if zirconRImg.Name != "" {
-		imgFile, err := openNetsvcFile(zirconRNetsvcName, zirconRImg.Path)
+		imgFile, err := openNetsvcFile(kernelNetsvcName, zirconRImg.Path)
 		if err != nil {
 			return err
 		}