arm64: Remove SMP support

As ARM Trusted Firmware is the only first class citizen for
booting arm64 multi-processor in coreboot remove SMP
support. If SoCs want to bring up MP then ATF needs to be
ported and integrated.

Change-Id: Ife24d53eed9b7a5a5d8c69a64d7a20a55a4163db
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: http://review.coreboot.org/11909
Tested-by: build bot (Jenkins)
Reviewed-by: Julius Werner <jwerner@chromium.org>
18 files changed