rockchip: rk3288-tinker: Use common bss and stack addresses

rockchip: rk3288-tinker: Use common bss and stack addresses

Migrate to use common bss, stack and malloc heap size and addresses to
unify memory use in TPL, SPL and pre-reloc.

Ensure SYS_MALLOC_F_LEN and TPL variant stay at 0x2000 and is unaffected
on other boards not changed to use common malloc heap size.

ENV_OFFSET is using the default value of 0x3f8000 and is also dropped.

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