* [Target] Only append default keys if target doesn't have any yet
This allows target parsers to provide their own target keys. Without this
change, the default keys would always be appended, which may or may not
be desirable.
* Add "cpu" to ARM CPU keys
* Add "cpu" to the keys in the mprofile target parser
* Restore the mprofile cpptest, since the "cpu" key is back
* So the -device attribute is actually needed...
Krzysztof Parzyszek
6def53aeaa