ASoC: fix SND_SOC_LOCHNAGAR_SC kconfig warning

Fix kconfig warning for SND_SOC_LOCHNAGAR_SC:

WARNING: unmet direct dependencies detected for SND_SOC_LOCHNAGAR_SC
  Depends on [n]: SOUND [=y] && !UML && SND [=y] && SND_SOC [=m] && MFD_LOCHNAGAR [=n]
  Selected by [m]:
  - SND_SOC_ALL_CODECS [=m] && SOUND [=y] && !UML && SND [=y] && SND_SOC [=m] && COMPILE_TEST [=y]

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Piotr Stankiewicz <piotrs@opensource.cirrus.com>
Cc: Charles Keepax <ckeepax@opensource.cirrus.com>
Cc: Richard Fitzgerald <rf@opensource.cirrus.com>
Cc: patches@opensource.cirrus.com
Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: alsa-devel@alsa-project.org
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>