AMD: Drop redundant test for CONFIG_RAMTOP

Same test is already done in x86/mtrr.h.

Change-Id: Ib0785d047567374294b9ee7afc4f4244f9ced926
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/5620
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
2 files changed