mbed test with dual core targets
mbed test with dual core targets

For Dual Core targets, there are in fact 2 sub-targets, CM4 and CM7 targets.
This allows to execute tests with boards detected by mbedls.

mbedmicro/mbed,kjbracey-arm/mbed,mbedmicro/mbed,kjbracey-arm/mbed,mbedmicro/mbed,mbedmicro/mbed,kjbracey-arm/mbed,mbedmicro/mbed,kjbracey-arm/mbed