u-boot-fw-uitls: add recipe bbappend

Add u-boot-fw-utils_2013.07.bbappend for himx machine. Because in yocto
release 1.5 (dora) u-boot-fw-utils_2013.07.bb configures u-boot source and
requires the correct u-boot configuration.

Signed-off-by: Mario Schuknecht <m.schuknecht@dresearch.de>