rockchip: board: Move gpt_capsule_update_setup() call

Move the call to gpt_capsule_update_setup() from the weak function
rk_board_late_init() into the main board_late_init() function.

Also change to use IS_ENABLED() instead for defined().

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