mainboards: remove direct acpi_slp_type usage

Use the acpi_is_wakeup_s3() API instead of comparing
a raw value to a global variable. This allows for
easier refactoring.

Change-Id: I2813b5d275cbe700be713272e3a88fdb5759db99
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/15690
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Tested-by: build bot (Jenkins)
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>
3 files changed