1. Override IlinkOverrideProgramEntryLabel and IlinkProgramEntryLabel to specify
entry point for debuger.
2. Refer to doc at the link below for post-export steps. Usually, 'export' is nearly
out of the box and just install 'Nu-Link Driver (IAR)' to update Nuvoton device
database in IAR.
https://github.com/OpenNuvoton/NuMaker-mbed-docs/blob/master/IAR/DEBUG_IAR.md
Reference template file is used from IAR8.32 installation available at path
"Embedded Workbench 8.2\arm\config\template\ConvertToIAR\template_project.ewp"
Also added trustzone configs in iar_definitions.json