ASoC: Intel: don't select RT5640 if !I2C

The rt5640 driver won't compile without I2C enabled. Hence, the Intel
Haswell and Baytrail+RT5640 ASoC drivers must also depend on I2C, since
these select RT5640.

This solves:
sound/soc/codecs/rt5640.c:2220:1: warning: data definition has no type or storage class [enabled by default]
sound/soc/codecs/rt5640.c:2220:1: error: type defaults to ‘int’ in declaration of ‘module_i2c_driver’ [-Werror=implicit-int]
sound/soc/codecs/rt5640.c:2220:1: warning: parameter names (without types) in function declaration [enabled by default]
sound/soc/codecs/rt5640.c:2210:26: warning: ‘rt5640_i2c_driver’ defined but not used [-Wunused-variable]
Reported-by: Jim Davis <jim.epost@gmail.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

sound/soc/intel/Kconfig

@@ -32,7 +32,7 @@ config SND_SOC_INTEL_BAYTRAIL
 
 config SND_SOC_INTEL_HASWELL_MACH
 	tristate "ASoC Audio DSP support for Intel Haswell Lynxpoint"
-	depends on SND_SOC_INTEL_SST && X86_INTEL_LPSS
+	depends on SND_SOC_INTEL_SST && X86_INTEL_LPSS && I2C
 	select SND_SOC_INTEL_HASWELL
 	select SND_SOC_RT5640
 	help
@@ -43,7 +43,7 @@ config SND_SOC_INTEL_HASWELL_MACH
 
 config SND_SOC_INTEL_BYT_RT5640_MACH
 	tristate "ASoC Audio driver for Intel Baytrail with RT5640 codec"
-	depends on SND_SOC_INTEL_SST && X86_INTEL_LPSS
+	depends on SND_SOC_INTEL_SST && X86_INTEL_LPSS && I2C
 	select SND_SOC_INTEL_BAYTRAIL
 	select SND_SOC_RT5640
 	help