amd/stoneyridge: Move acpi_get_sleep_type to sb_util

Relocate the acpi_get_sleep_type() function out of the southbridge
ramstage file.  This will make it more convenient for using elsewhere.

Change-Id: Id7ba709bb867fb00ed6c7fa7526de087a3b9b3ca
Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-on: https://review.coreboot.org/22722
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Richard Spiegel <richard.spiegel@silverbackltd.com>
Reviewed-by: Martin Roth <martinroth@google.com>
2 files changed