AGESA fam14: Use common callouts

Backported from fam15tn and fam16kb.

This also implements GetHeapBase() to satisfy some requirements
of HAVE_ACPI_RESUME for the following boards:
  amd/inagua
  amd/south_station
  amd/union_station
  asrock/e350m1

Change-Id: I488d063d4eabf4bf45bcbabd1e8f13b88b2ef401
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/5658
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
26 files changed