Bring up the secondary core. Enable hotplug with supporting
powering off secondary core.
Signed-off-by: NJun Nie <jun.nie@linaro.org>
Signed-off-by: NArnd Bergmann <arnd@arndb.de>

Add basic code for ZTE ZX296702 platform.

[arnd: removed unused zx296702_init_machine function, and changed
       l2c aux val to default]
Signed-off-by: NJun Nie <jun.nie@linaro.org>
Signed-off-by: NArnd Bergmann <arnd@arndb.de>