openharmony-tools: Add images and configuration to run qemuarma7

This addes Linux kernel and rootfs images, and the configuration file needed for using these with runqemu.

After installing and setting up the environment simply run

runqemu publicvnc serialstdio images/qemuarma7/*.qemuboot.conf

Signed-off-by: Esben Haabendal esben@geanix.com