ACPI S3 support: Add acpi_s3_resume_allowed()

Add this to reduce the amount of preprocessor conditionals used in the source,
compiler currently resolves this to a constant.

Once we have gone through all #if CONFIG_HAVE_ACPI_RESUME cases, we may change
the implementation to enable/disable S3 support runtime.

Change-Id: I0e2d9f81e2ab87c2376a04fab38a7c951cac7a07
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/6060
Tested-by: build bot (Jenkins)
4 files changed