Merge pull request #10507 from kfnta/mbed_spm_init

PSA: mbedSPM correct SPM initialization order

Author: 0xc0170

rtos/TARGET_CORTEX/mbed_rtos_rtx.c

@@ -91,8 +91,8 @@ MBED_NORETURN void mbed_rtos_start()
 
 #if defined(COMPONENT_SPE)
     // At this point, the mailbox is already initialized
-    spm_hal_start_nspe();
     psa_spm_init();
+    spm_hal_start_nspe();
 #endif // defined(COMPONENT_SPE)
 
 #if defined(COMPONENT_NSPE) && defined(COMPONENT_SPM_MAILBOX)