arm64: defconfig: Enable Sun4i SPDIF module

Allwinner A64 and H6 use the Sun4i SPDIF driver.

Enable this to allow a proper support.
Signed-off-by: Clément Péron <peron.clem@gmail.com>
Signed-off-by: Chen-Yu Tsai <wens@csie.org>

arch/arm64/configs/defconfig

@@ -559,6 +559,7 @@ CONFIG_SND_SOC_ROCKCHIP_RT5645=m
 CONFIG_SND_SOC_RK3399_GRU_SOUND=m
 CONFIG_SND_SOC_SAMSUNG=y
 CONFIG_SND_SOC_RCAR=m
+CONFIG_SND_SUN4I_SPDIF=m
 CONFIG_SND_SOC_AK4613=m
 CONFIG_SND_SOC_ES7134=m
 CONFIG_SND_SOC_ES7241=m