ASoC: cs4271: Split SPI and I2C code into different modules

Currently the cs4271 driver depends on SND_SOC_I2C_AND_SPI.
So the driver cannot be built as built-in if CONFIG_I2C=m.
Split SPI and I2C code into different modules to avoid this issue.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Brian Austin <brian.austin@cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/cirrus/Kconfig

@@ -36,7 +36,8 @@ config SND_EP93XX_SOC_EDB93XX
 	tristate "SoC Audio support for Cirrus Logic EDB93xx boards"
 	depends on SND_EP93XX_SOC && (MACH_EDB9301 || MACH_EDB9302 || MACH_EDB9302A || MACH_EDB9307A || MACH_EDB9315A)
 	select SND_EP93XX_SOC_I2S
-	select SND_SOC_CS4271
+	select SND_SOC_CS4271_I2C if I2C
+	select SND_SOC_CS4271_SPI if SPI_MASTER
 	help
 	  Say Y or M here if you want to add support for I2S audio on the
 	  Cirrus Logic EDB93xx boards.