AGESA: Add OemCustomize hooks structure

We should potentially provide an OEM platform hook to manipulate parameters
around any entry point to AGESA. Use structure for such ops to avoid weak
functions and lots of empty function stubs.

Change-Id: I99bf7de8a1e2f183399d2216520a45d0c24fd64c
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/7824
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
24 files changed