ASoC: Add AU1761 audio codec as selectable option

This commit adds the ADI AU1761 audio codec as a selectable option
in the kernel config.  Currently the driver can only be selected
for ADI blackfin devices or if SND_SOC_ALL_CODECS is enabled.
Signed-off-by: Bryce Ferguson <bryce.ferguson@rockwellcollins.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/Kconfig

@@ -302,12 +302,14 @@ config SND_SOC_ADAU1761
 	select SND_SOC_ADAU17X1
 
 config SND_SOC_ADAU1761_I2C
-	tristate
+	tristate "Analog Devices AU1761 CODEC - I2C"
+	depends on I2C
 	select SND_SOC_ADAU1761
 	select REGMAP_I2C
 
 config SND_SOC_ADAU1761_SPI
-	tristate
+	tristate "Analog Devices AU1761 CODEC - SPI"
+	depends on SPI
 	select SND_SOC_ADAU1761
 	select REGMAP_SPI