buildscript: Generate checksum for *.tar and *.img

Some devices use .tar or .img for their firmware images. Our buildscript
currently only generates checksums for .bin files. Therefore, generate
checksums for .tar and .img files as well.

Signed-off-by: Fabian Bläse <fabian@blaese.de>
Acked-By: Johannes Kimmel <fff@bareminimum.eu>

buildscript

@@ -316,7 +316,7 @@ buildrelease() {
     fi
 
     cd bin/$variant
-    for binary in *.bin; do
+    for binary in *.bin *.img *.tar; do
         md5sum "$binary" > ./"$binary".md5
         sha256sum "$binary" > ./"$binary".sha256
     done