Audio: Smart Amp: Convert from component- to module API

NOTE: This change has not been tested in any functional setup

For smart_amp to remain compatible with developing SOF it has to be
converted to use module API. The component API as such does not allow
llext loading or user-space usage. However, its unlikely the module
will work out of the box after this change, but in any case this
should make it easier to take smart_amp again into use.

This patch converts this component to module adapter API.
  - New() becomes simpler init()
  - Params() is handled in module adapter, in init()
    "mod->verify_params_flags = BUFF_PARAMS_CHANNELS;" replaces
     smart_amp_verify_params()
  - Channels check in params() is placed to separate function
    smart_amp_ipc4_params() to be called from prepare()
  - cmd() handler is changed to module adapter client style with
    smart_amp_set_configuration() and smart_amp_get_configuration().
  - smart_amp_copy() becomes module API smart_amp_process() function
  - smart_amo_prepare() picks sources and sink and does other
    preparations for processing
  - smart_amp_trigger() does the same thing as before, zeroes feedback
    buffer at playback start
  - Preliminary IPC4 support added

Signed-off-by: Jyri Sarha <jyri.sarha@linux.intel.com>

Author: Jyri Sarha