uboot-phytec

spl: atf: pass NULL for bl32_ep pc

ATF use bl32_ep_info->pc to decide if thre is an available bl32,
let's mark it as NULL first.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Acked-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>