uboot-phytec

smdk5250: config: enable max77686 driver support

This commit enable support for the above driver,
which was disabled in common config.

Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
Acked-by: Simon Glass <sjg@chromium.org>
Cc: Simon Glass <sjg@chromium.org>
Cc: Minkyu Kang <mk7.kang@samsung.com>