ASoC: Intel: avs: Introduce avs_log_buffer_status_locked()

Simplify locking of firmware log gathering by providing single location
for such purpose.

Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://lore.kernel.org/r/20221202152841.672536-5-cezary.rojewski@intel.com


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