S3 support in Q35

[krystian-hebel]

Dasharo version (if applicable)

v0.2.0

Dasharo variant (if applicable)

QEMU Q35

Affected component(s) or functionality (if applicable)

S3 sleep and resume

Brief summary

Analyze feasibility of support for S3 sleep for this platform. QEMU monitor has system_wakeup function which suggests it should be possible. OVMF required S3 to be disabled due to how UEFI variables are implemented there, but it is different with coreboot.

Additional context

S3 isn't supported by firmware for this emulated platform. Ubuntu seems to be able to halt the system, but instead of waking up, firmware does full initialization.