baremetal: Add IAR AVR32 toolchain support
baremetal: Add IAR AVR32 toolchain support

This commit adds a basic support of the IAR Embedded Workbench
toolchain for the AVR32 processors family:

 * https://www.iar.com/iar-embedded-workbench/#!?architecture=AVR32

Change-Id: I9e93055301f6cb0689246a4f97350b622324b04f
Reviewed-by: Ivan Komissarov <96f14e4d07227e958f51f7d2898113639e9498d9@gmail.com>
Reviewed-by: Christian Kandeler <3aa99dcdd3f0cac61fb81c2a11771c0cc2497607@qt.io>

qt-labs/qbs,qt-labs/qbs,qt-labs/qbs,qt-labs/qbs,qtproject/qt-labs-qbs,qt-labs/qbs,qtproject/qt-labs-qbs,qtproject/qt-labs-qbs,qt-labs/qbs,qtproject/qt-labs-qbs,qtproject/qt-labs-qbs,qt-labs/qbs,qtproject/qt-labs-qbs,qtproject/qt-labs-qbs