arm64: defconfig: Enable SND_ALOOP

Enable generic PCM loopback driver.

On NVIDIA Jetson platforms, customers use this to loop data between
container based applications and host OS.
Signed-off-by: Sameer Pujar <spujar@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm64/configs/defconfig

@@ -789,6 +789,7 @@ CONFIG_LOGO=y
 # CONFIG_LOGO_LINUX_VGA16 is not set
 CONFIG_SOUND=y
 CONFIG_SND=y
+CONFIG_SND_ALOOP=m
 CONFIG_SND_HDA_TEGRA=m
 CONFIG_SND_HDA_CODEC_HDMI=m
 CONFIG_SND_SOC=y