ASoC: intel: restore IRQs on error

This should be spin_unlock_irqrestore() instead of spin_unlock()

Fixes: 22981243 ('ASoC: Intel: Add Haswell/Broadwell IPC')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Mark Brown <broonie@linaro.org>