ASoC: Fix dependency of CONFIG_SND_PXA2XX_SOC_IMOTE2

wm8940 requires I2C.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/soc/pxa/Kconfig

@@ -138,7 +138,7 @@ config SND_PXA2XX_SOC_MIOA701
 
 config SND_PXA2XX_SOC_IMOTE2
        tristate "SoC Audio support for IMote 2"
-       depends on SND_PXA2XX_SOC && MACH_INTELMOTE2
+       depends on SND_PXA2XX_SOC && MACH_INTELMOTE2 && I2C
        select SND_PXA2XX_SOC_I2S
        select SND_SOC_WM8940
        help