tfm: Fix TF-M nonsecure interface disptach handling in pre kernel

Fix TF-M nonsecure interface dispatch handling when calling secure
service before the kernel is fully active.

This fixes crash in nordicsemi_nrf53_init, which is called with
PRE_KERNEL_1, when calling soc_secure_gpio_pin_mcu_select.

Signed-off-by: Joakim Andersson <joakim.andersson@nordicsemi.no>