agesa: Always include family* Kconfig

Otherwise we generate a recursive dependency because
CPU_AMD_AGESA depends on the per-family configurations
while those only exist if CPU_AMD_AGESA is selected.

Change-Id: Ic08d517ff4ca8bb76afc1574b55c54b28ec3f1b0
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/5490
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>