util/gitconfig: Replace printf with heredoc

The `gitconfig.sh` script contains a call to `printf` with a lengthy
argument where no format string is used at all. Replace it with a
heredoc for better readability.

Change-Id: I42dbaa570ab9661991fa5d9b4577c9aed05c2981
Signed-off-by: Alex Thiessen <alex.thiessen.de+coreboot@gmail.com>
Reviewed-on: https://review.coreboot.org/23251
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
1 file changed