Dualcpu: Execute dual-cpu init after RTX kernel init completes

NS mailbox initialization creates semaphore. CMSIS-RTOS v2 API
requires that semaphore creation API shall be called after
osKernelInitialize().
Move dual-cpu init, including NS mailbox init, after
osKernelInitialize() in main() in RTX implementation.

Signed-off-by: David Hu <david.hu@arm.com>
Change-Id: I1fc810c4bd9256555da882e9ba3a88a45d416aec
1 file changed