Some of the Blackfin options don't directly follow the kconfig options
they depend on, so kconfig is unable to display the proper tree.  So sort
the options such they expand/collapse properly.
Signed-off-by: Barry Song <barry.song@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>