ASoC: SOF: topology: fix the ipc_size calculation for process component

The topology private struct is used for token parsing and its size
should not be included to the ipc_size, fix it here though it didn't
cause any real issue as the Firmware won't use this wrong-added data.

Signed-off-by: Keyon Jie <yang.jie@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Reviewed-by: Jaska Uimonen <jaska.uimonen@intel.com>
Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Link: https://lore.kernel.org/r/20200825235040.1586478-5-ranjani.sridharan@linux.intel.com


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