Phase II.X.W: extend the AcpiVerb enum with two new variants
for the S3 round-trip:
* AcpiVerb::SetS3WakingVector (= 5): acpid writes the
kernel's S3 resume trampoline address to FACS.
Mirrors Linux 7.1's acpi_set_firmware_waking_vector.
The 8-byte write payload is the address in
little-endian. A zero payload is a sentinel for 'use the
kernel's default trampoline address' (s3_trampoline
symbol).
* AcpiVerb::EnterS3 (= 6): acpid requests the kernel to
enter S3. The kernel's stop::enter_s3() reads the
SLP_TYP value from S3_SLP_TYP and does the PM1 register
write. The actual S3 entry happens via acpid writing
to /scheme/sys/kstop.
Hardware-agnostic: works on any x86_64 system with
standard ACPI S3 support (Dell, HP, Lenovo, LG Gram 14).
On Modern Standby-only systems (LG Gram 16 (2025)), the
kernel never enters S3 so these verbs are no-ops.
vasilito
b0f4fee4c4