Make update-microcodes.sh executable.

Make update-microcodes.sh executable.

This also has an additional benefit:

I was running "sh update-microcodes.sh" previously which broke with

  update-microcodes.sh: 102: Bad substitution

due to the script requiring /bin/bash instead of /bin/sh (uses bash-specific
stuff). Running "bash update-microcodes.sh" works fine.

Making the script executable in svn reduces the likelyhood of people
running the script with differing shells that may not work.

Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@5963 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1