ASoC: fix I2C build errors

Fix soc build errors when I2C is built as a loadable module:

(.text+0x5d26b): undefined reference to `i2c_master_send'
soc-cache.c:(.text+0x5d32d): undefined reference to `i2c_transfer'
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/soc-cache.c

@@ -108,7 +108,7 @@ static unsigned int snd_soc_8_16_read(struct snd_soc_codec *codec,
 		return cache[reg];
 }
 
-#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
+#if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE))
 static unsigned int snd_soc_8_16_read_i2c(struct snd_soc_codec *codec,
 					  unsigned int r)
 {
@@ -200,7 +200,7 @@ int snd_soc_codec_set_cache_io(struct snd_soc_codec *codec,
 		break;
 
 	case SND_SOC_I2C:
-#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
+#if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE))
 		codec->hw_write = (hw_write_t)i2c_master_send;
 #endif
 		if (io_types[i].i2c_read)