uboot-imx

rockchip: Turn off CONFIG_SPL_LED for firefly

With LED support enabled the SPL easily goes over the size limit (e.g.
with both Debians gcc 4.9 and 5.2 cross-compilers). Turn off LED support
in the SPL to reduce the size just enough for those compilers.

Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Tweaked commit subject to remove _SUPPORT
Signed-off-by: Simon Glass <sjg@chromium.org>