ASoC: Drop soc-topology ABI v4 support

Merge series from Cezary Rojewski <cezary.rojewski@intel.com>:

This patchset impacts UAPI.

The only known users of the soc-topology ABI v4 are Chromebook
configurations. Starting from kernel v5.4, all of them are making use of
soc-topology ABI v5. The patchset first removes obsolete code from the
Intel's skylake-driver - the driver of choice for the mentioned
Chromebooks - and then proceeds with removal of relevant soc-topology.c
and uapi bits.

Cezary Rojewski (4):
  ASoC: Intel: Skylake: Remove soc-topology ABI v4 support
  ASoC: topology: Remove ABI v4 support
  ASoC: topology: Cleanup after ABI v4 support removal
  ASoC: topology: Remove obsolete ABI v4 structs

 include/uapi/sound/asoc.h               |  56 ------
 include/uapi/sound/skl-tplg-interface.h |  74 --------
 sound/soc/intel/skylake/skl-topology.c  | 169 -----------------
 sound/soc/soc-topology.c                | 241 ++----------------------
 4 files changed, 18 insertions(+), 522 deletions(-)

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2.25.1