The driver is used for AMD board using DA7219 and MAX98357 codec.

TEST=Build, apply grunt_mixer_settings:
  iotools mmio_write32 0xfed80e40 0x040c40c0
  iotools mmio_write32 0xfed80e28 0x10000
  iotools mmio_write8 0xfed816de 0xc0
  aplay -D plughw:0,0 ./sample_48000.wav -vv
  aplay -D plughw:0,0 ./sample_44100.wav -vv
Signed-off-by: Akshu Agrawal <akshu.agrawal@amd.com>
Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Mark Brown <broonie@kernel.org>