Unzips /boot/Image and /boot/vmlinuz

I have

$ md5sum  /boot/Image /boot/vmlinuz
62ef910bc79c1fd48074b4ae2ce44f8e  /boot/Image
62ef910bc79c1fd48074b4ae2ce44f8e  /boot/vmlinuz

which eats up space on the already tight partition. If vmlinuz is already uncompressed with 5.x we don't need an additional Image anymore making our diff even smaller.