MLK-25644: arm64: configs: imx_v8_defconfig: add SND_ALOOP configuration

sound/drivers/aloop.c should be compiled in order to support AFE wrapper.
So the corresponding configuration, that is SND_ALOOP,
needs to be added to arch/arm64/configs/imx_v8_defconfig in the type of module.

Signed-off-by: Chancel Liu <chancel.liu@nxp.com>