ASoC: SOF: ipc4-loader: Save the maximum number of libraries supported

The firmware supports external libraries (containing modules) to be loaded
runtime.
The firmware configuration contains the maximum number of libraries
supported, including the base firmware (which is library 0).

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Chao Song <chao.song@intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://lore.kernel.org/r/20221020121238.18339-9-peter.ujfalusi@linux.intel.com


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