MCU: Support having additional defaultPaths for packages

It is possible that some packages have different defaultValue paths depending on how the package was installed or what version was the package

As part of this task, QtC should be able to understand the additionalPaths|additionalDefaultPaths keyword present in platforms json files, similarly to how it is working currently with additionalDetectionPaths

                 "detectionPath": {

                    "windows": "ide/LinkServer/binaries/crt_emu_cm_redlink.exe",

                    "linux": "ide/LinkServer/binaries/crt_emu_cm_redlink"

                },

                "additionalDetectionPaths": [

                    "ide/binaries/crt_emu_cm_redlink.exe",

                    "ide/binaries/crt_emu_cm_redlink"

                ], 

What's currenlty in mind is this will be usefull specially for the TVII-GraphicsDriver path

Example:

defaultValue: "C:/TVII-GraphicsDriver"
additionalDefaultValues: ["C:/Program Files/TVII-GraphicsDriver"]

defaultValue should be kept for backward compatibility