soc/amd/stoneyridge/southbridge.c: Store PM related registers in cbmem

PM registers used for generating SWS values are being stored in a static
variable within southbridge.c. In order to have it available for any source
involved in building the platform, move the storage to cbmem, using id
CBMEM_ID_POWER_STATE. Also add a variable that informs from which state
the system is waking from, extracted from register ACPI_PM1_CNT_BLK. This
variable will later be useful in detecting failed S3 resume.

BUG=b:80119811
TEST=Add code to print SWS parameters and state it's waking from. Build
and boot grunt, suspend and resume, check output for valid values. Remove
the print code.

Change-Id: Ib27a743b7e7f8c94918caf7ba5efd473f4054986
Signed-off-by: Richard Spiegel <richard.spiegel@silverbackltd.com>
Reviewed-on: https://review.coreboot.org/27109
Reviewed-by: Martin Roth <martinroth@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

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