ASoC: SOF: Intel: fix resume from hibernate

Merge series from Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>:

The enablement of IMR-based DSP boot helped reduce resume latency, but
unfortunately the context is not saved in S4 and S5 which leads to
multiple reports of boot failures.

This patchset forces a full firmware reload/reboot when resuming from
S4/S5 and restores functionality.