ramips: Incorrect file mode change

Commit d0f5ab6d95a1 ("ramips: Added support for ZBT-826 / ZBT-1026")
incorrectly changed the mode of the ramips shell scripts from 755 to 644.
I.e., they are not excutable any more and for example devices will be left
with broken configs.

Signed-off-by: Kristian Evensen <[email protected]>

SVN-Revision: 48893