ASoC: sun8i-codec: Remove analog "HP" widget

The "HP" widget is already present and take part to
the analog part (sun8i-codec-analog).

Remove it from the digital part as it is unnecessary.

Signed-off-by: Mylène Josserand <mylene.josserand@free-electrons.com>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Mark Brown <broonie@kernel.org>