baremetal: Add IAR Renesas SH toolchain support
baremetal: Add IAR Renesas SH toolchain support

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

 * https://www.renesas.com/cn/en/products/microcontrollers-microprocessors/superh.html

Change-Id: I04a0b1d73f27898ad18cc3eb9949caaf2a0d0647
Reviewed-by: Ivan Komissarov <96f14e4d07227e958f51f7d2898113639e9498d9@gmail.com>
Reviewed-by: Christian Kandeler <3aa99dcdd3f0cac61fb81c2a11771c0cc2497607@qt.io>

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