ASoC: mx27vis: Remove unused file

i.MX has been converted to a devicetree-only platform and
asoc-mx27vis.h is no longer used.

Get rid of this unused file.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Link: https://lore.kernel.org/r/20210315193842.183042-1-festevam@gmail.com


Signed-off-by: Mark Brown <broonie@kernel.org>