grub2: add hash

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

boot/grub2/grub2.hash

@@ -0,0 +1,2 @@
+# Locally calculated after checking pgp signature
+sha256	784ec38e7edc32239ad75b8e66df04dc8bfb26d88681bc9f627133a6eb85c458	grub-2.00.tar.xz