arm: rk3368: Select ARCH_EARLY_INIT_R when used

On the lion and evb-px5 platforms, we need this function, so select it.

Cc: Andy Yan <andy.yan@rock-chips.com>
Cc: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Cc: Klaus Goger <klaus.goger@theobroma-systems.com>
Signed-off-by: Tom Rini <trini@konsulko.com>