rockchip: rk3288: add arch_cpu_init in spl

Add arch_cpu_init() in SPL for soc related init, and
move configure_l2ctlr() into it.
The arch_cpu_init() only need to run once, so no need
to run in TPL.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
3 files changed