ASoC: meson: gx: add gx-formatter and gx-interface

These files are the basic block which allow to shape I2S in GX devices
the same as the AXG ones: the DAI backend only controls the interface
(i.e. clocks and pins) whereas a formatter takes care of properly
formatting the data.

gx-formatter and gx-interface are strongly inspired to axg-tdm-formatter
and axg-tdm, respectively. The long term plan is to join the two platforms
to use the same formatter solution.

There is only a minor addition here compared to what has been done for
AXG and it's "gx_formatter_create()" which is required in order to let
already existing AIU code to make use of this formatter without making any
devicetree change.

Signed-off-by: Valerio Setti <vsetti@baylibre.com>
Reviewed-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://patch.msgid.link/20260610-reshape-aiu-as-axg-v2-1-cac3663a8b51@baylibre.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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