We should gurantee that we do not use SRAM during Zephyr early
boot, until SystemInit has returned. This commit aims to ensure
that SystemInit will be branched to, without first pushing args
to stack, even when no optimizations are selected. We chose to
define z_platform_init in assembly directly (instead of using
inline assembly) as it appears to be a cleaner design.
Signed-off-by: Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>
9fe8a207b5