The model_id is no longer needed within the platform_data
for the TPA driver since the model of TPA specified
with the device name (tpa6130a2/tpa6140a2).

Also update rx51 (the only affected user) to use the device name rather
than platform data.
Signed-off-by: NPeter Ujfalusi <peter.ujfalusi@ti.com>
Tested-by: NJarkko Nikula <jarkko.nikula@bitmer.com>
Acked-by: NLiam Girdwood <lrg@ti.com>
Acked-by: NTony Lindgren <tony@atomide.com>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>