The WM8904 codec driver needs I2C to be enabled, so the
SND_ATMEL_SOC_WM8904 option also requires this.

Found using randconfig build testing.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NXia Kaixu <kaixu.xia@linaro.org>
Signed-off-by: NMark Brown <broonie@linaro.org>