rockchip: rk3399-puma: Use common bss and stack addresses

The rk3399-puma board is currently using SPL stack and bss addr in SRAM,
the same addr typically used by TPL, this differs from most other RK3399
boards.

Switch to use the common bss and stack addresses introduced in commit
008ba0d5 ("rockchip: Add common default bss and stack addresses").

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>