ASoC: Intel: Skylake: Remove soc-topology ABI v4 support

The only known users are Chromebook configurations. Starting from
kernel v5.4, all of them are making use of soc-topology ABI v5.

Cc: Curtis Malainey <cujomalainey@chromium.org>
Cc: Łukasz Majczak <lmajczak@google.com>
Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://msgid.link/r/20240403091629.647267-2-cezary.rojewski@intel.com


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