uboot-phytec

rockchip: rk3399: use common secure_timer_init() for spl/tpl

SPL/TPL share the same secure_timer_init(), update to use
one copy source code and update to use CONFIG_ROCKCHIP_STIMER_BASE
as base address and rename to function name to rockchip_stimer_init().

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