Convert Tegra to use struct smp_operations to provide its SMP
and CPU hotplug operations.

Tested on Harmony.
Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com>
Acked-by: NStephen Warren <swarren@nvidia.com>
Acked-by: NOlof Johansson <olof@lixom.net>
Acked-by: NNicolas Pitre <nico@linaro.org>
Signed-off-by: NArnd Bergmann <arnd@arndb.de>